Update .travis.yml
Update .travis.yml

Add more php versions to verify compatibility
drdk/SolrBundle,floriansemm/SolrBundle,starsystemsindia/SolrBundle,clarity-project/SolrBundle,drdk/SolrBundle,frank-und-freunde/SolrBundle,zquintana/SunSearchBundle,zquintana/SunSearchBundle,andythorne/SolrBundle,floriansemm/SolrBundle,cegeka/fd-solr-bundle,clarity-project/SolrBundle