message: Fix hackatom schema
diff: "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "BalanceResponse",
  "type": "object",
  + "required": [
  + "amount"
  + ],
  "properties": {
  "amount": {
  - "type": [
  - "array",
  - "null"
  - ],
  - "items": {
  "$ref": "#/definitions/Coin"
  }
  - }
  },
  "definitions": {
  "Coin": {
  