Travis optimizations  - disable sudo to enable linux container  - no longer run "composer self-update"  - run composer install within install section  - run composer install with "--prefer-source" as of travis can't download packages from github
Travis optimizations
 - disable sudo to enable linux container
 - no longer run "composer self-update"
 - run composer install within install section
 - run composer install with "--prefer-source" as of travis can't download packages from github

marc-mabe/php-enum