update android version

android/AndroidManifest.xml

 <?xml version="1.0"?>
-<manifest package="org.mavlink.qgroundcontrol" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="2.9.7b-362-g303a70c" android:versionCode="2888" android:installLocation="auto">
+<manifest package="org.mavlink.qgroundcontrol" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="3.0.0" android:versionCode="2970" android:installLocation="auto">
     <application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="-- %%INSERT_APP_NAME%% --" android:icon="@drawable/icon">
         <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|locale|fontScale|keyboard|keyboardHidden|navigation" android:name="org.qgroundcontrol.qgchelper.UsbDeviceJNI" android:label="-- %%INSERT_APP_NAME%% --" android:screenOrientation="sensorLandscape" android:launchMode="singleTask" android:keepScreenOn="true">
             <intent-filter>

tools/update_android_version.sh

 #!/usr/bin/env bash
 
-# this requires `master` in the git tree
-#  travis-ci branch builds are unable to set the version properly
+# this requires `origin/master` in the git tree
 
 MANIFEST_FILE=android/AndroidManifest.xml
 
-VERSIONCODE=`git rev-list master --first-parent --count`
+VERSIONCODE=`git rev-list origin/master --first-parent --count`
 VERSIONNAME=`git describe --always --tags | sed -e 's/^v//'`
 
 if [ -n "$VERSIONCODE" ]; then