refactor: Reset the protocol of the proxy server (PR #210)

Author: aacerox

lib/NrcIoManager.js

@@ -242,6 +242,7 @@ export default class NrcIoManager extends events.EventEmitter {
       result.proxy = {
         host: config.proxy.host,
         port: config.proxy.port,
+        protocol: config.proxy.protocol,
         // if proxy tunnel use 'CONNECT' method, else get method from request
         method: config.useProxyTunnel ? 'CONNECT' : connectMethod,
         // if proxy tunnel set proxy path else get request path