version in nimble file redundant with git tag of package?
what's the utility of the version field in a nimble file?

I feel this is redundant with a package git tag and can only cause confusion; an un-tagged package shouldn't be treated as such because the whole point of a tag is to be associated with a fixed commit

eg:
```
NIMBLE_DIR=$HOME/.nimble_fake78g XDG_CONFIG_HOME= nimble install https://github.com/disruptek/testes@1.0.0

 Installing https://github.com/juancarlospaco/nim-bytes2human@any version
Downloading https://github.com/juancarlospaco/nim-bytes2human using git
  Verifying dependencies for bytes2human@0.2.2
 Installing bytes2human@0.2.2

=> installs $HOME/.nimble_fake78g/pkgs/bytes2human-0.2.2/

in nim-bytes2human:
grep version bytes2human.nimble
version     = "0.2.2"

git rev-parse HEAD
ec2c1a758cabdd4751a06c8ebf2b923f19e32731

git fetch --tags
git tag # empty
```
