Update instructions for settings ANDROID_HOME
Update instructions for settings ANDROID_HOME

According to the instructions from `brew install android-sdk`:

    You may need to add the following to your .bashrc:
      export ANDROID_HOME=/usr/local/opt/android-sdk
seadowg/windsock-android,seadowg/windsock-android,DroidsOnRoids/deckard-gradle,eggertj12/Oturgjold,yjliugit/gradletest,jdonmoyer/deckard-gradle,WonderCsabo/deckard-gradle,ankitrokdeonsns/sulabh-android-app,WonderCsabo/deckard-maven,toshihirock/AndroidEspresso2Sample,sweetleon/android-sample-todo-list,robolectric/deckard-maven,Mounika-Chirukuri/deckard,403462630/deckard-gradle-test,robolectric/deckard-maven,vogellacompany/deckard-gradle,0359xiaodong/deckard,robolectric/deckard,seadowg/windsock-android,seadowg/deckard-gradle