Change version no. mentioned in README
Change version no. mentioned in README

version no. should match to the one mentioned in crosswalk.sh
jordansexton/react-native-webview-crosswalk,Asiance/react-native-webview-crosswalk,jordansexton/react-native-webview-crosswalk,nushydude/react-native-webview-crosswalk,Asiance/react-native-webview-crosswalk,nushydude/react-native-webview-crosswalk