Revert "Specify PHP 5.4 as version for scrutinizer"

.scrutinizer.yml

@@ -1,13 +1,3 @@
-application:
-    environment:
-        php:
-            version: 5.4
-  
-build:
-    environment:
-        php:
-            version: 5.4
-
 filter:
     excluded_paths:
         - '3rdparty/*'