Merge tag '0.6.1' into develop

0.6.1
Modernize Gemfile.
CI all branches.
Update flay gem.
Update flog gem.
Update rspec gem.
Update RuboCop gem.
Updated changelog.
Merge pull request #13 from trema/feature/modernize_gemfile

Feature/modernize gemfile
Version bump.
Merge branch 'release/0.6.2'