Merge pull request #7063 from rictic/progress-module

[one-liner] ProgressBar should also be a module, for ES6 importing

progress/progress.d.ts

@@ -115,7 +115,7 @@ declare module "progress"
          */
         terminate():void;
     }
-
+    module ProgressBar { }
 
     export = ProgressBar;
 }