Add symfony-meta folder as PHP library into plugin

Author: King2500

src/main/resources/META-INF/plugin.xml

@@ -120,6 +120,7 @@
         <typeProvider3 implementation="fr.adrienbrault.idea.symfony2plugin.doctrine.ObjectRepositoryResultTypeProvider"/>
         <typeProvider3 implementation="fr.adrienbrault.idea.symfony2plugin.doctrine.ObjectManagerFindTypeProvider"/>
         <typeProvider3 implementation="fr.adrienbrault.idea.symfony2plugin.assistant.signature.MethodSignatureTypeProvider"/>
+        <libraryRoot id="symfony_meta" path="/symfony-meta/" runtime="false"/>
     </extensions>
 
     <extensions defaultExtensionNs="com.intellij">