Simplify build

Author: christopheradams

.credo.exs

@@ -6,7 +6,7 @@ rvm:
   - 2.3.0
 
 install:
-  - bundle install
+  - gem install mdl rake
 
 script:
-  - bundle exec rake test
+  - rake test

.travis.yml

@@ -23,9 +23,8 @@ formatting/markup/style rules so that the style remains consistent:
 Use Ruby and [Markdownlint] to check your changes:
 
 ```sh
-gem install bundler
-bundle install
-bundle exec rake test
+gem install mdl rake
+rake test
 ```
 
 **IMPORTANT**: By submitting a patch, you agree that your work will be

CODE_OF_CONDUCT.md

@@ -1128,7 +1128,7 @@ project.
 [Chinese Traditional]: https://github.com/elixirtw/elixir_style_guide/blob/master/README_zhTW.md
 [Code Analysis]: https://github.com/h4cc/awesome-elixir#code-analysis
 [Code Of Conduct]: https://github.com/christopheradams/elixir_style_guide/blob/master/CODE_OF_CONDUCT.md
-[Contributing]: https://github.com/christopheradams/elixir_style_guide/blob/master/CONTRIBUTING.md
+[Contributing]: https://github.com/elixir-lang/elixir/blob/master/CODE_OF_CONDUCT.md
 [Contributors]: https://github.com/christopheradams/elixir_style_guide/graphs/contributors
 [Elixir Style Guide]: https://github.com/christopheradams/elixir_style_guide
 [Elixir]: http://elixir-lang.org

CONTRIBUTING.md

@@ -1,9 +1,12 @@
 task :test do
   exit_code = 0
   files = ["README.md", "CONTRIBUTING.md"]
+  # 'MD036' # Emphasis used instead of a header
+  # 'MD033' # Inline HTML - allow for anchor links in each bullet point
+  rules = ['~MD036', '~MD033'].join(",")
   files.each do |file|
     begin
-      sh "bundle exec mdl --style 'markdown.rb' #{file}"
+      sh "mdl --rules #{rules} #{file}"
     rescue Exception => ex
       exit_code = 1
     end

Gemfile

@@ -26,8 +26,7 @@ defmodule ElixirStyleGuide.Mixfile do
   end
 
   defp deps do
-    [{:ex_doc, ">= 0.0.0", only: :dev},
-     {:credo, "~> 0.5", only: [:dev, :test]}]
+    []
   end
 
   defp docs() do