[CHORE] Gemfile.lock out of version control (#27)

* Gemfile.lock out of version control

* Can't force the Gemfile.lock to be frozen as it will be regenerated each time

* Pin Rubocop

* Add note to changelog

Author: maschwenk

.gitignore

@@ -4,3 +4,7 @@
 /spec/reports/
 /tmp/
 .DS_Store
+
+# Gemfile.lock should not be under version control
+# https://yehudakatz.com/2010/12/16/clarifying-the-roles-of-the-gemspec-and-gemfile/
+Gemfile.lock

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 ### Changed
 
 ### Removed
+- Removed `Gemfile.lock` from source control
 
 ## [v0.5.1](https://github.com/bugcrowd/vrt-ruby/compare/v0.5.0...v0.5.1) - 2018-05-15
 ### Changed

Dockerfile

@@ -1,8 +1,5 @@
 FROM ruby:2.3-alpine
 
-# throw errors if Gemfile has been modified since Gemfile.lock
-RUN bundle config --global frozen 1
-
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 

Gemfile.lock

@@ -21,6 +21,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', '~> 1.14'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec'
-  spec.add_development_dependency 'rubocop', '~> 0.48'
+  spec.add_development_dependency 'rubocop', '0.48.1'
   spec.add_development_dependency 'pry'
 end