[TASK] Travis: Remove hhvm-nightly for now

hhvm-nightly is no longer available on travi-ci and removed
from the build for now.

Releases: master
Change-Id: I92751c17e6e2a2f55fd956ff0a9fe069edb180aa
Reviewed-on: http://review.typo3.org/39615


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>

.travis.yml

@@ -3,7 +3,6 @@ language: php
 matrix:
   allow_failures:
     - php: 7
-    - php: hhvm-nightly
 
   include:
     - php: 5.5
@@ -12,8 +11,6 @@ matrix:
       env: UNIT_TESTS=yes FUNCTIONAL_TESTS=yes PHP_LINT=yes
     - php: 7
       env: UNIT_TESTS=yes
-    - php: hhvm-nightly
-      env: UNIT_TESTS=yes
 
 services:
   - memcached