Add Gemfile.lock to project

https://bundler.io/v1.16/guides/faq.html#committing-lockfiles-in-libraries

.gitignore

@@ -10,5 +10,4 @@
 .rvmrc
 *.sublime-project
 *.sublime-workspace
-Gemfile.lock
 *.gem

Gemfile.lock

@@ -0,0 +1,68 @@
+PATH
+  remote: .
+  specs:
+    rqrcode (2.0.0)
+      chunky_png (~> 1.0)
+      rqrcode_core (~> 1.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    chunky_png (1.4.0)
+    diff-lcs (1.4.4)
+    parallel (1.20.1)
+    parser (3.0.1.0)
+      ast (~> 2.4.1)
+    rainbow (3.0.0)
+    rake (13.0.3)
+    regexp_parser (2.1.1)
+    rexml (3.2.5)
+    rqrcode_core (1.0.0)
+    rspec (3.10.0)
+      rspec-core (~> 3.10.0)
+      rspec-expectations (~> 3.10.0)
+      rspec-mocks (~> 3.10.0)
+    rspec-core (3.10.1)
+      rspec-support (~> 3.10.0)
+    rspec-expectations (3.10.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-mocks (3.10.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-support (3.10.2)
+    rubocop (1.12.1)
+      parallel (~> 1.10)
+      parser (>= 3.0.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.2.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.4.1)
+      parser (>= 2.7.1.5)
+    rubocop-performance (1.10.1)
+      rubocop (>= 0.90.0, < 2.0)
+      rubocop-ast (>= 0.4.0)
+    ruby-progressbar (1.11.0)
+    standard (1.0.5)
+      rubocop (= 1.12.1)
+      rubocop-performance (= 1.10.1)
+    standardrb (1.0.0)
+      standard
+    unicode-display_width (2.0.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bundler (~> 2.0)
+  rake (~> 13.0)
+  rqrcode!
+  rspec (~> 3.5)
+  standardrb (~> 1.0)
+
+BUNDLED WITH
+   2.2.15