allow build failures for php nightly versions

Author: ramunasd

.travis.yml

@@ -22,6 +22,11 @@ env:
   - SYMFONY_VERSION=3.3.*
   - SYMFONY_VERSION=3.4.*
 
+matrix:
+  fast_finish: true
+  allow_failures:
+  - php: nightly
+
 install:
   - if [ "$SYMFONY_VERSION" != "" ]; then composer require --no-update symfony/dependency-injection:${SYMFONY_VERSION} symfony/framework-bundle:${SYMFONY_VERSION} symfony/http-kernel:${SYMFONY_VERSION}; fi;