release version 1.6.0
Fix travis configuration with jruby and rbx, update mri
fix bug with travis
Prepare spec for method delegation

Signed-off-by: Ahmy Yulrizka <yulrizka@gmail.com>
Add code climate test coverage
fix webmock for codeclimate
Fix code climate test helper
Merge branch 'feature/add-codeclimate-coverage' into develop
Add test coverage badge