Drop PHPStan level 4 because it's being confused by Cake's EntityInterface.

themrwilliams · themrwilliams · commit 370a7ed4c6fe · 2019-05-17T14:10:41.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -19,8 +19,6 @@ matrix:
   include:
     - php: 5.6
       env: PHPCS=1 DEFAULT=0
-    - php: 7.1
-      env: PHPSTAN=4 DEFAULT=0
     - php: 7.1
       env: PHPSTAN=5 DEFAULT=0
 
