increment a project's gradle version

increment_version.gradle

task increment {
    doLast {
        String patch=version.substring(version.lastIndexOf('.')+1)
        int m=patch.toInteger()+1
        String majorMinor=version.substring(0,version.lastIndexOf('.'))
        String s=buildFile.getText().replaceFirst("version='${version}'","version='${majorMinor}.${m}'")
        buildFile.setText(s)
    }
}