title: 31.0.0 is not a valid SDK Version. Options are 32.0.0 UNVERSIONED
body: <p>I am unable to run my app on my simulator as well as device.Earlier it was working.</p>
  
  <p>I have tried every step mentioned in this blog</p>
  
  <p><a href="https://blog.expo.io/expo-sdk-v31-0-0-is-now-available-cad6d0463f49" rel="noreferrer">Official Blog for updation</a></p>
  
  <p>My <code>package.json</code> is</p>
  
  <pre><code>{
  "main": "node_modules/expo/AppEntry.js",
    "scripts": {
  "android-windows": "react-native bundle --platform android --dev false --entry-file App.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res &amp;&amp; react-native run-android",
  "start": "expo start",
  "android": "expo start --android",
  "ios": "expo start --ios",
  "eject": "expo eject",
  "debugWindow": "start 'rndebugger://set-debugger-loc?host=localhost&amp;port=8081'",
  "debugLinux": "open 'rndebugger://set-debugger-loc?host=localhost&amp;port=8081'"
   },
  
  "dependencies": {
      "expo": "^31.0.4",
      "react": "16.5.0",
      "react-native": "https://github.com/expo/react-native/archive/sdk-31.0.1.tar.gz",
      "react-navigation": "^3.0.8"
    },
    "devDependencies": {
      "babel-preset-expo": "^5.0.0"
    },
    "private": true
  }
  </code></pre>
  
  <p>And <code>App.json</code> is </p>
  
  <pre><code>{
  
  
   "expo": {
      "name": "AwesomeProject",
      "slug": "AwesomeProject",
      "privacy": "public",
      "sdkVersion": "31.0.0",
      "platforms": [
        "ios",
        "android"
      ],
      "version": "1.0.0",
      "orientation": "portrait",
      "icon": "./assets/icon.png",
      "splash": {
        "image": "./assets/splash.png",
        "resizeMode": "contain",
        "backgroundColor": "#ffffff"
      },
      "updates": {
        "fallbackToCacheTimeout": 0
      },
      "assetBundlePatterns": [
        "**/*"
      ],
      "ios": {
        "supportsTablet": true
      }
    }
  }
  </code></pre>
  
  <p>I have tried running <code>npm install</code> 2-3 times but nothing seems to work.</p>
  
  <p>I can't understand why its been suggesting <strong>option 32.0.0</strong> when there is no <strong>release notes</strong> for this option at this link.
  <a href="https://docs.expo.io/versions/v31.0.0/workflow/upgrading-expo" rel="noreferrer"> Upgrading Expo </a></p>