code coverage added

.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
@@ -16,3 +16,7 @@ checks:
         fix_line_ending: true
         fix_identation_4spaces: true
         fix_doc_comments: true
+tools:
+    external_code_coverage:
+        timeout: 600
+        runs: 3