Fix unexpected "Requires clean working directory" error in `neil version` commands

[rads]

If the :deps-file path isn't resolved to the absolute path in git-opts, the following error happens even with a clean working directory:

$ neil --version
neil 0.1.48

$ neil version patch
----- Error --------------------------------------------------------------------
Type:     clojure.lang.ExceptionInfo
Message:  Requires clean working directory unless --force is provided
Data:     {}

This wasn't caught by the tests since we pass in a different :deps-file which has the absolute path.

This PR fixes the problem by calling fs/canonicalize on the :deps-file path before passing it down to the helper functions.

[borkdude]

Could you also update the changelog? I really need to put a PR template in here as a reminder, I'll do that tomorrow

[rads]

@borkdude: It's already in the PR template, but don't worry, I won't forget next time. 😄