Release "Upgrade to Android X"

Hey @vikeri!

Could you issue another release of the library, which would include ["Upgraded to Android X" commit](https://github.com/vikeri/react-native-background-job/commit/83cde8515a2d8e3af8fa0475f6fd233386a3af2d). Apparently, there was no releases since then, but this would fix compilation (well, in some cases).

Also it fixes #168