fixup! feat(coap-request): adapt to http-request

Author: JKRhb

coap/coap-request.js

@@ -66,7 +66,7 @@ module.exports = function (RED) {
                 reqOpts = msg.method.toUpperCase();
             }
 
-            reqOpts.headers = msg["headers"];
+            reqOpts.headers = msg.headers;
             if (reqOpts.headers == null) {
                 reqOpts.headers = {};
             }