Merge pull request ruby-ldap#305 from guilhermewop/gw-typo-fix

typo fix

Author: HarlemSquirrel

lib/net/ldap/connection.rb

@@ -610,7 +610,7 @@ def password_modify(args)
     pdu = queued_read(message_id)
 
     if !pdu || pdu.app_tag != Net::LDAP::PDU::ExtendedResponse
-      raise Net::LDAP::ResponseMissingError, "response missing or invalid"
+      raise Net::LDAP::ResponseMissingOrInvalidError, "response missing or invalid"
     end
 
     pdu