diff --git a/yarn.lock b/yarn.lock
index 63824b0..31c9593 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1423,12 +1423,11 @@ clap@^1.0.9:
   dependencies:
     chalk "^1.1.3"
 
-clean-css@^3.3.0:
-  version "3.4.28"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-3.4.28.tgz#bf1945e82fc808f55695e6ddeaec01400efd03ff"
+clean-css@^4.1.11:
+  version "4.1.11"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.11.tgz#2ecdf145aba38f54740f26cefd0ff3e03e125d6a"
   dependencies:
-    commander "2.8.x"
-    source-map "0.4.x"
+    source-map "0.5.x"
 
 cli-cursor@^2.1.0:
   version "2.1.0"
@@ -1537,12 +1536,6 @@ combined-stream@^1.0.5, combined-stream@~1.0.5:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@2.8.x:
-  version "2.8.1"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.8.1.tgz#06be367febfda0c330aa1e2a072d3dc9762425d4"
-  dependencies:
-    graceful-readlink ">= 1.0.0"
-
 commander@^2.9.0:
   version "2.15.1"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.15.1.tgz#df46e867d0fc2aec66a34662b406a9ccafff5b0f"
@@ -2885,10 +2878,6 @@ graceful-fs@^4.1.11, graceful-fs@^4.1.2:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
-"graceful-readlink@>= 1.0.0":
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
-
 growly@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/growly/-/growly-1.3.0.tgz#f10748cbe76af964b7c96c93c6bcc28af120c081"
@@ -5273,24 +5262,24 @@ public-encrypt@^4.0.0:
     parse-asn1 "^5.0.0"
     randombytes "^2.0.1"
 
-pug-attrs@^2.0.2:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/pug-attrs/-/pug-attrs-2.0.2.tgz#8be2b2225568ffa75d1b866982bff9f4111affcb"
+pug-attrs@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/pug-attrs/-/pug-attrs-2.0.3.tgz#a3095f970e64151f7bdad957eef55fb5d7905d15"
   dependencies:
     constantinople "^3.0.1"
     js-stringify "^1.0.1"
-    pug-runtime "^2.0.3"
+    pug-runtime "^2.0.4"
 
-pug-code-gen@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/pug-code-gen/-/pug-code-gen-2.0.0.tgz#96aea39a9e62f1ec5d2b6a5b42a29d528c70b43d"
+pug-code-gen@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/pug-code-gen/-/pug-code-gen-2.0.1.tgz#0951ec83225d74d8cfc476a7f99a259b5f7d050c"
   dependencies:
     constantinople "^3.0.1"
     doctypes "^1.1.0"
     js-stringify "^1.0.1"
-    pug-attrs "^2.0.2"
+    pug-attrs "^2.0.3"
     pug-error "^1.3.2"
-    pug-runtime "^2.0.3"
+    pug-runtime "^2.0.4"
     void-elements "^2.0.1"
     with "^5.0.0"
 
@@ -5298,73 +5287,73 @@ pug-error@^1.3.2:
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/pug-error/-/pug-error-1.3.2.tgz#53ae7d9d29bb03cf564493a026109f54c47f5f26"
 
-pug-filters@^2.1.5:
-  version "2.1.5"
-  resolved "https://registry.yarnpkg.com/pug-filters/-/pug-filters-2.1.5.tgz#66bf6e80d97fbef829bab0aa35eddff33fc964f3"
+pug-filters@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/pug-filters/-/pug-filters-3.1.0.tgz#27165555bc04c236e4aa2b0366246dfa021b626e"
   dependencies:
-    clean-css "^3.3.0"
+    clean-css "^4.1.11"
     constantinople "^3.0.1"
     jstransformer "1.0.0"
     pug-error "^1.3.2"
-    pug-walk "^1.1.5"
+    pug-walk "^1.1.7"
     resolve "^1.1.6"
     uglify-js "^2.6.1"
 
-pug-lexer@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/pug-lexer/-/pug-lexer-3.1.0.tgz#fd087376d4a675b4f59f8fef422883434e9581a2"
+pug-lexer@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/pug-lexer/-/pug-lexer-4.0.0.tgz#210c18457ef2e1760242740c5e647bd794cec278"
   dependencies:
     character-parser "^2.1.1"
     is-expression "^3.0.0"
     pug-error "^1.3.2"
 
-pug-linker@^3.0.3:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/pug-linker/-/pug-linker-3.0.3.tgz#25f59eb750237f0368e59c3379764229c0189c41"
+pug-linker@^3.0.5:
+  version "3.0.5"
+  resolved "https://registry.yarnpkg.com/pug-linker/-/pug-linker-3.0.5.tgz#9e9a7ae4005682d027deeb96b000f88eeb83a02f"
   dependencies:
     pug-error "^1.3.2"
-    pug-walk "^1.1.5"
+    pug-walk "^1.1.7"
 
-pug-load@^2.0.9:
-  version "2.0.9"
-  resolved "https://registry.yarnpkg.com/pug-load/-/pug-load-2.0.9.tgz#ee217c914cc1d9324d44b86c32d1df241d36de7a"
+pug-load@^2.0.11:
+  version "2.0.11"
+  resolved "https://registry.yarnpkg.com/pug-load/-/pug-load-2.0.11.tgz#e648e57ed113fe2c1f45d57858ea2bad6bc01527"
   dependencies:
     object-assign "^4.1.0"
-    pug-walk "^1.1.5"
+    pug-walk "^1.1.7"
 
-pug-parser@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/pug-parser/-/pug-parser-4.0.0.tgz#c9f52322e4eabe4bf5beeba64ed18373bb627801"
+pug-parser@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/pug-parser/-/pug-parser-5.0.0.tgz#e394ad9b3fca93123940aff885c06e44ab7e68e4"
   dependencies:
     pug-error "^1.3.2"
     token-stream "0.0.1"
 
-pug-runtime@^2.0.3:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/pug-runtime/-/pug-runtime-2.0.3.tgz#98162607b0fce9e254d427f33987a5aee7168bda"
+pug-runtime@^2.0.4:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/pug-runtime/-/pug-runtime-2.0.4.tgz#e178e1bda68ab2e8c0acfc9bced2c54fd88ceb58"
 
-pug-strip-comments@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/pug-strip-comments/-/pug-strip-comments-1.0.2.tgz#d313afa01bcc374980e1399e23ebf2eb9bdc8513"
+pug-strip-comments@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/pug-strip-comments/-/pug-strip-comments-1.0.3.tgz#f1559592206edc6f85310dacf4afb48a025af59f"
   dependencies:
     pug-error "^1.3.2"
 
-pug-walk@^1.1.5:
-  version "1.1.5"
-  resolved "https://registry.yarnpkg.com/pug-walk/-/pug-walk-1.1.5.tgz#90e943acbcf7021e6454cf1b32245891cba6f851"
+pug-walk@^1.1.7:
+  version "1.1.7"
+  resolved "https://registry.yarnpkg.com/pug-walk/-/pug-walk-1.1.7.tgz#c00d5c5128bac5806bec15d2b7e7cdabe42531f3"
 
 pug@^2.0.0-rc.4:
-  version "2.0.0-rc.4"
-  resolved "https://registry.yarnpkg.com/pug/-/pug-2.0.0-rc.4.tgz#b7b08f6599bd5302568042b7436984fb28c80a13"
-  dependencies:
-    pug-code-gen "^2.0.0"
-    pug-filters "^2.1.5"
-    pug-lexer "^3.1.0"
-    pug-linker "^3.0.3"
-    pug-load "^2.0.9"
-    pug-parser "^4.0.0"
-    pug-runtime "^2.0.3"
-    pug-strip-comments "^1.0.2"
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/pug/-/pug-2.0.3.tgz#71cba82537c95a5eab7ed04696e4221f53aa878e"
+  dependencies:
+    pug-code-gen "^2.0.1"
+    pug-filters "^3.1.0"
+    pug-lexer "^4.0.0"
+    pug-linker "^3.0.5"
+    pug-load "^2.0.11"
+    pug-parser "^5.0.0"
+    pug-runtime "^2.0.4"
+    pug-strip-comments "^1.0.3"
 
 punycode@1.3.2:
   version "1.3.2"
@@ -6041,24 +6030,24 @@ source-map-support@^0.5.0:
   dependencies:
     source-map "^0.6.0"
 
-source-map@0.4.x, source-map@^0.4.2, source-map@^0.4.4:
+source-map@0.5.6, source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.1, source-map@~0.5.3:
+  version "0.5.6"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
+
+source-map@0.5.x, source-map@~0.5.6:
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
+
+source-map@^0.4.2, source-map@^0.4.4:
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.4.4.tgz#eba4f5da9c0dc999de68032d8b4f76173652036b"
   dependencies:
     amdefine ">=0.0.4"
 
-source-map@0.5.6, source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.1, source-map@~0.5.3:
-  version "0.5.6"
-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
-
 source-map@^0.6.0, source-map@^0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
 
-source-map@~0.5.6:
-  version "0.5.7"
-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
-
 spawn-sync@^1.0.15:
   version "1.0.15"
   resolved "https://registry.yarnpkg.com/spawn-sync/-/spawn-sync-1.0.15.tgz#b00799557eb7fb0c8376c29d44e8a1ea67e57476"