this is test

Fixed bugs:

• github_changelog_generator/generator/generator_tags.rb:61:in detect\_since\_tag': undefined method[]' for nil:NilClass (NoMethodError) #351

Closed issues:

• Add a LICENSE file #369
• Error installing on Ubuntu 14.04 #364

Merged pull requests:

• Move dev gems to add_development_dependency #373 (skywinder)
• Add MIT LICENSE file #370 (olleolleolle)
• Avoid nil bug in detect_since_tag #368 (olleolleolle)