Rails 4.2 env entry was removed from Travis CI as a simple workaround for failing tests in 593de1b86b57f9070c5904c5491bcfc32f1df089. As Rails 4.2 is still supported (see the latest merge commit – 237cbbde1a3e763ee208b08424c03d4f00e93cd6) it should be tested against in Travis CI as well.
Rails 4.2 env entry was removed from Travis CI as a simple workaround for failing tests in 593de1b86b57f9070c5904c5491bcfc32f1df089. As Rails 4.2 is still supported (see the latest merge commit – 237cbbde1a3e763ee208b08424c03d4f00e93cd6) it should be tested against in Travis CI as well.
To understand the changes see https://docs.travis-ci.com/user/languages/ruby/#bundler-20, 9506b5e45acb64ac5d7565d268390622bfbacc65 and Travis CI jobs.