TravisCI: Disable Composer update for PHP 5.3 (#115)
TravisCI: Disable Composer update for PHP 5.3 (#115)

Follow up to 1000cdb to skip running `composer self-update` with PHP
5.3.3. The base Composer version at Travis is now new enough that
self-update fails when TLS is not available and the self-update action
does not seem to honor the `disable-tls` and `secure-http` config
settings.
wikimedia/composer-merge-plugin,bd808/composer-merge-plugin