message: Update a link in IBC.md
diff: @@ -517,7 +517,7 @@ The
  contains both the original packet that was sent as well as the acknowledgement
  bytes returned from executing the remote contract. You can use the
  `original_packet` to
  -[map it the proper handler](https://github.com/CosmWasm/cosmwasm/blob/update-ibc-types/contracts/ibc-reflect-send/src/ibc.rs#L111-L136)
  +[map it the proper handler](https://github.com/CosmWasm/cosmwasm/blob/378b029707ebaed4505b3666c620bed69ff9a682/contracts/ibc-reflect-send/src/ibc.rs#L111-L136)
  (after parsing your custom data format), and parse the `acknowledgement` there,
  to determine how to respond:
  