simplifies configuration

This removes a few settings that had no effect anymore.

.scrutinizer.yml

@@ -1,8 +1,8 @@
 filter:
     excluded_paths: [tests/*]
+
 checks:
     php:
-        code_rating: true
         remove_extra_empty_lines: true
         remove_php_closing_tag: true
         remove_trailing_whitespace: true
@@ -16,20 +16,8 @@ checks:
         fix_line_ending: true
         fix_identation_4spaces: true
         fix_doc_comments: true
+
 tools:
     external_code_coverage:
         timeout: 600
         runs: 3
-    php_analyzer: true
-    php_code_coverage: false
-    php_code_sniffer:
-        config:
-            standard: PSR2
-        filter:
-            paths: ['src']
-    php_loc:
-        enabled: true
-        excluded_dirs: [vendor, tests]
-    php_cpd:
-        enabled: true
-        excluded_dirs: [vendor, tests]