Check Bioconductor standards for package versioning during submission

[bschilder]

Bioc strongly encourages (though it's not clear whether they enforce) new package submissions to use 0.99.Z version names, which designates them as pre-release:

https://github.com/Bioconductor/Contributions#what-to-expect
https://contributions.bioconductor.org/description.html#description-ver

In the DESCRIPTION file, I changed 0.0.0.9000 --> 0.99.0
In the NEWS file, I added the latest entry from 0.1.0 --> 0.99.0

[bschilder]

I've implemented these changes in both the rworkflows and main branches of my fork (to make merging PR from these branches easier later on):
https://github.com/bschilder/anndataR/tree/rworkflows