Feature/Add versionCode for checking exact bundle

[Stoneski93]

Add an build number checking to manage bundles in app.
Some developers bump only buildNumber and in this case package react on version or build update.

[vantuan88291]

Thanks for your PR, can you explain more why need add buildNumber in there?

[Stoneski93]

Yeah, I used to worked on projects where we bumped buildNumber only. Your package for now only react on change version.
We can have situation where we got version 1.0.0 and next builds will be builds that only when we change build numbers. So we can have update for specific version and build number, not only for version.

[vantuan88291]

I understand your point, but this library let you control the version from your backend side, i think you can refer this issue and see whether it can resolve your issue: #13