install codeclimate-test-reporter when Travis CI executes `bundle install`
install codeclimate-test-reporter when Travis CI executes `bundle install`

By https://github.com/igrep/crispy/commit/54c3af0b1222dbf1fbbe5d29bcc63841ddc26624 , codeclimate-test-reporter is installed only when the environment variable is specified

igrep/crispy