Add named export for global plug (#337)

Author: marcospassos

src/index.ts

@@ -2,5 +2,9 @@ import {Configuration, Plug, GlobalPlug} from './plug';
 
 export type {Configuration, Plug};
 
+const plug = new GlobalPlug();
+
+export {plug};
+
 /* eslint-disable-next-line import/no-default-export -- Should be default export */
-export default new GlobalPlug();
+export default plug;