travis: added HHVM nightly

dg · dg · commit ceb636ea1e08 · 2015-03-27T18:22:57.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,11 +6,13 @@ php:
     - 5.6
     - 7.0
     - hhvm
+    - hhvm-nightly
 
 matrix:
     allow_failures:
         - php: 7.0
         - php: hhvm
+        - php: hhvm-nightly
 
 script:
     - vendor/bin/tester tests -s -p php -c tests/php-unix.ini
