Added formatter to XSD again, it was removed in #6be7552

Author: jgroth

Resources/config/schema/monolog-1.0.xsd

@@ -55,6 +55,7 @@
         <xsd:attribute name="dsn" type="xsd:string" />
         <xsd:attribute name="client-id" type="xsd:string" />
         <xsd:attribute name="use-ssl" type="xsd:boolean" />
+        <xsd:attribute name="formatter" type="xsd:string" />
     </xsd:complexType>
 
     <xsd:simpleType name="level">