Implemented free license claim

Implemented free license claim

steam/client/builtins/apps.py

@@ -244,3 +244,26 @@ class Apps(object):
             return EResult(resp.eresult), resp.purchase_result_details, details
         else:
             return EResult.Timeout, None, None
+
+    def request_free_license(self, app_ids):
+      """ Request license for free app
+
+      :param app_ids: list of app ids
+        :type  app_ids: :class:`list`
+        :return: format ``(granted_appids, granted_packageids)``
+        :rtype: :class:`tuple`
+
+    .. code:: python
+            [730] []
+
+      """
+      resp = self.send_job_and_wait(MsgProto(EMsg.ClientRequestFreeLicense),
+                                      {'appids': map(int, app_ids)},
+                                      timeout=30,
+                                      )
+
+      if resp.eresult != EResult.OK:
+        return EResult(resp.eresult)
+
+      else:
+        return resp.granted_appids, resp.granted_packageids