Upgrade react-native-webview to 8.1.2 for demo

demo/ios/Podfile.lock

     - React-cxxreact (= 0.61.5)
     - React-jsi (= 0.61.5)
   - React-jsinspector (0.61.5)
-  - react-native-webview (8.1.0):
+  - react-native-webview (8.1.2):
     - React
   - React-RCTActionSheet (0.61.5):
     - React-Core/RCTActionSheetHeaders (= 0.61.5)
   React-jsi: cb2cd74d7ccf4cffb071a46833613edc79cdf8f7
   React-jsiexecutor: d5525f9ed5f782fdbacb64b9b01a43a9323d2386
   React-jsinspector: fa0ecc501688c3c4c34f28834a76302233e29dc0
-  react-native-webview: 88d83b4df2e792cfc36c952b1c496e2ac01cf0b8
+  react-native-webview: 055c7110f17c2f19c971f655064ee480638db668
   React-RCTActionSheet: 600b4d10e3aea0913b5a92256d2719c0cdd26d76
   React-RCTAnimation: 791a87558389c80908ed06cc5dfc5e7920dfa360
   React-RCTBlob: d89293cc0236d9cb0933d85e430b0bbe81ad1d72

demo/package.json

     "react": "16.12.0",
     "react-native": "0.61.5",
     "react-native-autoheight-webview": "../",
-    "react-native-webview": "^8.1.0"
+    "react-native-webview": "^8.1.2"
   },
   "devDependencies": {
     "@babel/core": "^7.8.4",