HHVM no longer supported by composer. See composer/composer#8127

minnur · minnur · commit 24fd8fc9869e · 2020-12-21T21:23:28.000+05:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,6 @@ php:
   - 5.4
   - 5.5
   - 5.6
-  - hhvm
 dist: trusty
 before_script:
   - composer self-update
