Update contributing documentation.

`./script/bootstrap` will run `bundle install` Add development instructions to Contributing document.
jish · Dec 2, 2016 · 1287f4b · 1287f4b
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diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
@@ -23,6 +23,16 @@ shell environment (through `ENV`), or a YAML file. See
 `lib/plugins/pre_commit/configuration/providers/` for more information and
 details on how to create a new configuration provider if necessary.
 
+## Development
+
+Bootstrap a development environment:
+
+    $ ./script/bootstrap
+
+Run tests:
+
+    $ bundle exec rake test
+
 ---
 
 ### Closing old issues

diff --git a/script/bootstrap b/script/bootstrap
@@ -22,3 +22,5 @@ else
   echo "Please install npm."
 
 fi
+
+bundle check || bundle install