message: Fix invalid query message
diff: @@ -76,8 +76,8 @@ exports.random = (request, response, next) => {
  });
  };
  -const invalidPostMessage = [
  - "Invalid JSON submitted.",
  +const invalidJSONQueryMessage = [
  + "Invalid JSON query submitted.",
  "You need to submit a JSON object with an array of postcodes or geolocation objects.",
  "Also ensure that Content-Type is set to application/json"
  ].join(" ");
  @@ -90,7 +90,7 @@ exports.bulk = (request, response, next) => {
  } else {
  response.jsonApiResponse = {
  status: 400,
  - error: invalidPostMessage
  + error: invalidJSONQueryMessage
  };
  return next();
  }
  