fix(phpmd): support to WPBP boilerplate

Author: Mte90

codeat-phpmd.xml

@@ -5,9 +5,13 @@
     </description>
     <rule ref="rulesets/cleancode.xml">
         <exclude name="MissingImport"/>
+        <exclude name="BooleanArgumentFlag"/>
     </rule>
     <rule ref="rulesets/codesize.xml"/>
-    <rule ref="rulesets/design.xml"/>
+    <rule ref="rulesets/design.xml">
+        <exclude name="ExitExpression"/>
+        <exclude name="NumberOfChildren"/>
+    </rule>
     <rule ref="rulesets/naming.xml"/>
     <rule ref="rulesets/unusedcode.xml">
         <exclude name="UnusedLocalVariable"/>