Add encryption label to .travis.yml

[dilyand]

E.g.:

$ gem install travis
$ travis encrypt-file project/travis-deploy-key project/travis-deploy-key.enc
encrypting project/travis-deploy-key for [org]/[repo]
storing result as project/travis-deploy-key.enc
storing secure env variables for decryption

Please add the following to your build script (before_install stage in your .travis.yml, for instance):

    openssl aes-256-cbc -K $encrypted_3afbfedfa397_key -iv $encrypted_3afbfedfa397_iv -in project/travis-deploy-key.enc -out project/travis-deploy-key -d

Pro Tip: You can add it automatically by running with --add.

Make sure to add project/travis-deploy-key.enc to the git repository.
Make sure not to add project/travis-deploy-key to the git repository.
Commit all changes to your .travis.yml.

In this case the encryption label is 3afbfedfa397.