chore: update readme

Author: KazuCocoa

README.md

@@ -5,16 +5,6 @@ A fork of Google's Android ApiDemos application, used for testing Appium
 
 #### Building
 
-> android update project --subprojects --target android-19 --path . --name ApiDemos
->
-> ant clean debug
->
-> adb install -r ./bin/ApiDemos-debug.apk
+> npm run build
 
-Or `npm run-script prepublish`, which does the same thing.
-
-#### emma build for testing code coverage
-
-> ant clean instrument
->
-> adb install -r ./bin/ApiDemos-instrumented.apk
+Then, `./apks/ApiDemos-debug.apk` will be generated.