Update README.md: stubEnabled prop was removed in #455

Author: epaew

README.md

@@ -89,11 +89,10 @@ A react context provider for LIFF (LINE Front-end Framework)
      import App from './App';
 
      const liffId = process.env.REACT_APP_LINE_LIFF_ID;
-     const stubEnabled = process.env.NODE_ENV !== 'production';
 
      ReactDOM.render(
        <React.StrictMode>
-         <LiffProvider liffId={liffId} stubEnabled={stubEnabled}>
+         <LiffProvider liffId={liffId}>
            <App />
          </LiffProvider>
        </React.StrictMode>,