Update Loofah to 2.2.3

flavorjones/loofah#154

Gemfile.lock

@@ -198,7 +198,7 @@ GEM
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    loofah (2.2.2)
+    loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.0)
@@ -216,7 +216,7 @@ GEM
     net-ssh (4.2.0)
     newrelic_rpm (4.7.1.340)
     nio4r (2.2.0)
-    nokogiri (1.8.2)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     non-stupid-digest-assets (1.0.9)
       sprockets (>= 2.0)
@@ -443,4 +443,4 @@ RUBY VERSION
    ruby 2.4.2p198
 
 BUNDLED WITH
-   1.16.3
+   1.17.1