Fixing PHPStan CI

Author: moufmouf

.travis.yml

@@ -2,6 +2,7 @@ language: php
 sudo: false
 php:
   - 7.1
+  - 7.2
 env:
   global:
   # We need to prefer source to get PHPStan test directory. Otherwise, it is removed from ZIP

phpstan.neon

@@ -1,6 +1,6 @@
 parameters:
     ignoreErrors:
      - '#Call to an undefined method Roave\\BetterReflection\\Reflection\\ReflectionFunctionAbstract::getDeclaringClass().#'
-
+     - '#Call to an undefined method Roave\\BetterReflection\\Reflection\\Reflection::implementsInterface().#'
 includes:
     - phpstan-strict-rules.neon