Add extra phpcs checks (#5)

Squiz.WhiteSpace.MemberVarSpacing for enforcing new lines between class
properties.

PSR12.Functions.ReturnTypeDeclaration for how to write return types.

Author: arnoudhgz

src/MediactMagento2/ruleset.xml

@@ -38,4 +38,12 @@
     <rule ref="PSR2.Classes.PropertyDeclaration.Underscore">
         <exclude-pattern>*.phtml</exclude-pattern>
     </rule>
+
+    <rule ref="Squiz.WhiteSpace.MemberVarSpacing" >
+        <properties>
+            <property name="spacingBeforeFirst" value="0"/>
+        </properties>
+    </rule>
+
+    <rule ref="PSR12.Functions.ReturnTypeDeclaration" />
 </ruleset>