Change incrby Decrby to return timestamp (#24)

* incrby/decrby return timestamp

Author: Ariel Shtul

redistimeseries/client.py

@@ -92,8 +92,8 @@ def __init__(self, *args, **kwargs):
             self.ALTER_CMD : bool_ok, 
             #self.ADD_CMD : bool_ok,
             #self.MADD_CMD : bool_ok,
-            self.INCRBY_CMD : bool_ok,
-            self.DECRBY_CMD : bool_ok,
+            #self.INCRBY_CMD : bool_ok,
+            #self.DECRBY_CMD : bool_ok,
             self.CREATERULE_CMD : bool_ok,
             self.DELETERULE_CMD : bool_ok,
             self.RANGE_CMD : parse_range,