Added php nightly for testing (is allowed to fail)

JanPetterMG · JanPetterMG · commit d1437441a10d · 2016-08-04T00:10:10.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,6 +6,10 @@ php:
   - 5.6
   - 5.5
   - hhvm
+  - nightly
+matrix:
+  allow_failures:
+    - php: nightly
 install:
   - composer install
 after_script:
