USe phpstan level 4 as default

acrobat · acrobat · commit fa84a25fbb7c · 2020-05-10T21:32:21.000+02:00
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
@@ -1,4 +1,4 @@
 parameters:
-	level: 0
+	level: 4
 	paths:
 		- lib
