Use phpunit 6.5

Nyholm · Nyholm · commit de2ef5f8c5b3 · 2018-12-27T08:43:06.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -12,7 +12,7 @@ branches:
 env:
   global:
     - TEST_COMMAND="composer test"
-    - SYMFONY_PHPUNIT_VERSION="6.3"
+    - SYMFONY_PHPUNIT_VERSION="6.5"
 
 matrix:
     fast_finish: true
