Information about "Howto fetch available dependency versions for unity manifest"

[JaXt0r]

As mentioned in #11 the version isn't available. No problem. I just recommend adding a hint howto check for available versions.
Will reference PR in a minute.

[intelligide]

I rewrote the installation documentation recently, but I'm not going to include a specific version, I don't really want to modify the documentation every time.

[JaXt0r]

Agreed. Nevertheless, feel free to merge the hint about version on your upm repository. Took me quite some time to figure it out. I hope it helps others using your solutions too.

I updated my Pull Request.