Remove Ruby 2.1.1 from allowed failures in travis config.
Remove Ruby 2.1.1 from allowed failures in travis config.

[ci skip]

kisoku/fpm-cookery,ryansch/fpm-cookery,cas-ei/fpm-cookery,devkid/fpm-cookery,devkid/fpm-cookery,ryansch/fpm-cookery,glensc/fpm-cookery,cas-ei/fpm-cookery,kisoku/fpm-cookery,glensc/fpm-cookery