title: AsyncStorage.getItem() doesn't seem to work
body: <p>When I try to set a value via AsyncStorage.getItem(), I cannot request it back.</p>
  <pre><code>let tokenData = null;
  const getData = async () =&gt; {
    let token;
    try {
      token = await AsyncStorage.getItem('token');
      tokenData = JSON.parse(token);
    } catch (e) {
      // error reading value
    }
  };
  </code></pre>
  <p>I have set item like follows</p>
  <pre><code>const setLoginLocal = async loginData =&gt; {
    try {
      let token = loginData.headers.authorization;
      let headerToken = ['token', JSON.stringify(token)];
      let user = ['user', JSON.stringify(loginData.data)];
      await AsyncStorage.setItem([user, headerToken]);
    } catch (err) {
      console.log(err);
    }
  };
  </code></pre>