fix: export StandaloneInnerObject (#131)

Author: killagu

standalone/standalone/index.ts

@@ -2,3 +2,4 @@ export * from './src/Runner';
 export * from './src/main';
 export * from './src/StandaloneInnerObjectProto';
 export * from './src/StandaloneContext';
+export * from './src/StandaloneInnerObject';