add MAHAndroidUpdater (#75)

* add MAHAndroidUpdater

Android app update checker lib. I want to add this to utils list

* Update README.md

Author: hummatli

辅助工具类Utils/README.md

@@ -966,3 +966,10 @@ Performance metrics library for Android development (includes dagger2metrics)
 <img src="https://raw.githubusercontent.com/frogermcs/androiddevmetrics/master/art/activities_metrics.png" width="480" />
 
 ---
+
+**MAHAndroidUpdater**: https://github.com/hummatli/MAHAndroidUpdater
+
+Android app update checker
+
+<img src="https://github.com/hummatli/MAHAndroidUpdater/blob/master/imgs/updater_dlg.png" width="200px"/> <img src="https://github.com/hummatli/MAHAndroidUpdater/blob/master/imgs/restricter_dlg.png" width="200px"/>
+---