optimise travis matrix

-

Author: lifeofguenter

.travis.yml

@@ -1,16 +1,13 @@
 language: php
 
-php:
-  - 7.1
-  - 7.0
-  - 5.6
-  - 5.5
-  - hhvm
-
 matrix:
   include:
     - php: 7.1
       env: RUN_COVERAGE=1
+    - php: 7.0
+    - php: 5.6
+    - php: 5.5
+    - php: hhvm
 
 sudo: false