lib: replace string concatenation with template

Author: VijiKannan

lib/_http_client.js

@@ -116,7 +116,7 @@ function ClientRequest(options, cb) {
 
   var path;
   if (options.path) {
-    path = '' + options.path;
+    path = String(options.path);
     var invalidPath;
     if (path.length <= 39) { // Determined experimentally in V8 5.4
       invalidPath = isInvalidPath(path);