update README
update README

floatinghotpot/cordova-plugin-admob,erperejildo/cordova-plugin-admob,sangwonl/cordova-plugin-admob,floatinghotpot/cordova-plugin-admob,Telerik-Verified-Plugins/AdMob,erperejildo/cordova-plugin-admob,johnwerd/wallpapers,Jeremy017/cordova-plugin-admob,M4E/cordova-plugin-admob,Jeremy017/cordova-plugin-admob,johnwerd/wallpapers,sangwonl/cordova-plugin-admob,M4E/cordova-plugin-admob,floatinghotpot/cordova-plugin-admob,M4E/cordova-plugin-admob,erperejildo/cordova-plugin-admob,erperejildo/cordova-plugin-admob,sangwonl/cordova-plugin-admob,Telerik-Verified-Plugins/AdMob,Jeremy017/cordova-plugin-admob,Telerik-Verified-Plugins/AdMob,Jeremy017/cordova-plugin-admob,floatinghotpot/cordova-plugin-admob,Telerik-Verified-Plugins/AdMob,johnwerd/wallpapers,sangwonl/cordova-plugin-admob,M4E/cordova-plugin-admob,johnwerd/wallpapers