[ruby-cvs:72245] shyouhei:r65145 (trunk): .travis.yml: just use env

[shyouhei at ruby-lang.org]

shyouhei	2018-10-18 10:56:30 +0900 (Thu, 18 Oct 2018)

  New Revision: 65145

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65145

  Log:
    .travis.yml: just use env
    
    You don't have to use `before_install` to introduce
    new environment variables; that is to be done using
    `env` command.

  Modified files:
    trunk/.travis.yml