Merge pull request #370 from redis/fix-missing-bitfield-get

fix: allows cmds.Bitfield() to be completed by Get()

Author: rueian

hack/cmds/commands.json

@@ -317,7 +317,8 @@
                   }
                 ]
               }
-            ]
+            ],
+            "optional": true
           }
         ]
       }