message: Fix wrong table name in exchange.abi
  Table_name should be `bids` and `asks` instead of `bid` and `ask`
diff: }
  ],
  "tables": [{
  - "table_name": "bid",
  + "table_name": "bids",
  "index_type": "i128i128",
  "key_names": [
  "buyer",
  ],
  "type": "bid"
  },{
  - "table_name": "ask",
  + "table_name": "asks",
  "index_type": "i128i128",
  "key_names": [
  "seller",
  