title: cannot lock ref 'refs/remotes/origin/master'
body: <p>I always got <code>cannot lock ref 'refs/remotes/origin/master'</code> when I execute <code>git pull</code> first time if there are some updates.</p>
  
  <p>The full console log is belows.</p>
  
  <pre><code>D:\code\react-native\expo-multi-screen-starter&gt;git pull
  error: cannot lock ref 'refs/remotes/origin/master': is at b2459b4d5af42622cba55f9fe47ccd14fbd879bc but expected 76f11048c866cfe3e6570eaacf90db3cb7732723
  From github.com:liudonghua123/expo-multi-screen-starter
   ! 76f1104..b2459b4  master     -&gt; origin/master  (unable to update local ref)
  
  D:\code\react-native\expo-multi-screen-starter&gt;git pull
   App.js                                          | 19 ++++-----
   src/navigation/AuthStack.js                     | 14 +++++++
   src/navigation/RootNavigator.js                 | 22 ++++++++++
   src/navigation/TabNavigator.js                  |  4 +-
   src/screens/AuthLoadingScreen.js                | 35 ++++++++++++++++
   src/screens/HomeScreen.js                       | 19 +++++++++
   src/screens/{LoginScreen.js =&gt; SignInScreen.js} | 54 ++++++++++++++++++++++---
   7 files changed, 147 insertions(+), 20 deletions(-)
   create mode 100644 src/navigation/AuthStack.js
   create mode 100644 src/navigation/RootNavigator.js
   create mode 100644 src/screens/AuthLoadingScreen.js
   rename src/screens/{LoginScreen.js =&gt; SignInScreen.js} (61%)
  
  D:\code\react-native\expo-multi-screen-starter&gt;
  </code></pre>