Test up to PHPUnit-6.4

malkusch · malkusch · commit 9b52b603af9d · 2017-10-13T11:48:48.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -12,6 +12,7 @@ env:
   - PHPUNIT_VERSION=~6.1.0
   - PHPUNIT_VERSION=~6.2.0
   - PHPUNIT_VERSION=~6.3.0
+  - PHPUNIT_VERSION=~6.4.0
 
 php:
   - 7.1
