Updating dependencies

- Updating Gemfile to use latest branch / version of Builderator for cookbook
- Fixing security warnings from Github
- Updating to Chef 14 and updating other dependencies
PD-18862

.ruby-version

@@ -1 +1 @@
-2.2.6
+2.4.1

Gemfile

@@ -1,14 +1,18 @@
 source 'https://rubygems.org'
 
-gem 'rake', '~> 10.5'
 gem 'aws-sdk', '~> 2.2'
 gem 'fpm', '~> 1.6'
-gem 'octokit', '~> 4.0'
+gem 'ffi', '~> 1.9.24'
 gem 'mime-types', '~> 3.1'
+gem 'minitar', '~> 0.6'
+gem 'octokit', '~> 4.0'
+gem 'rake', '~> 10.5'
+gem 'rack', '~> 2.0'
 
 group :cookbook do
-  gem 'builderator', '~> 1.0'
+  gem 'builderator', :git => 'git@github.com:rapid7/builderator.git', :branch => 'ubuntu1804'
+  gem 'chef', '~> 14.7.17'
   gem 'test-kitchen'
   gem 'kitchen-vagrant'
-  gem 'berkshelf', '~> 4.3'
+  gem 'berkshelf', '~> 6.2'
 end