Unable to uninstall package with cygwin source

### What You Are Seeing?
Error when uninstalling git with cygwin source:
```
Uninstalling the following packages:
git
Cygwin does not implement upgrade
```

### What is Expected?
git should be uninstalled

### How Did You Get This To Happen? (Steps to Reproduce)
`choco uninstall -y git -source cygwin -dv`

### Output Log

GIST LINK - https://gist.github.com/ferm10n/fbf3c5a74771d6c9e91bf89c8e0f3d85

Am I just not using this command correctly? Searches for that error message yielded no results.

Start by reproducing `choco uninstall -y git -source cygwin -dv` and review the uninstall handling for the cygwin source, using the linked debug log as context. Done means the git package is uninstalled successfully instead of reporting that Cygwin does not implement upgrade.

Written by the indexing model from the issue text.