Show plugin version in Plugin Manager list

Summary: Added plugin version property + showing it in Plugin Manager

Reviewed By: passy

Differential Revision: D21839544

fbshipit-source-id: 89daed813cffb066b3b584f6df97d6674ca6be08

desktop/app/src/dispatcher/plugins.tsx

@@ -39,6 +39,7 @@ export type PluginDefinition = {
   out?: string;
   gatekeeper?: string;
   entry?: string;
+  version: string;
 };
 
 export default (store: Store, logger: Logger) => {