New: add Bad Request (400) exception

Author: Alexander Golovanov

src/bad-request.js

@@ -0,0 +1,9 @@
+"use strict";
+
+import { HTTPError } from "./http";
+
+export class BadRequestError extends HTTPError {
+    constructor( message, extra ) {
+        super( 400, message || "Bad Request", extra );
+    }
+}

src/index.js

@@ -1,2 +1,3 @@
 export { HTTPError } from "./http";
 export { AccessDeniedError } from "./access-denied";
+export { BadRequestError } from "./bad-request";