bump android gradle to 3.1.4 - #20767

bump android gradle to 3.1.4#20767

gengjiawen wants to merge 3 commits into

react:masterreact/react-native:masterfrom

gengjiawen:feature/android_gradle_plugin_3.xgengjiawen/react-native:feature/android_gradle_plugin_3.xCopy head branch name to clipboard