recommended fix for go-slug does not work

[ibm-richard]

python-tfe version

0.1.2

Description

when attempting to use the pytfe .upload() command for a configuraiton version, it fails with the error that slug is undefined and that this can be fixed with a pip install go-slug command. pip reports that this package cannot be found.

Testing plan

`python -m pip install go-slug`

Expected Behavior

the upload() method should not fail

Actual Behavior

the upload() method does fail

Additional Context

python-tfe/src/pytfe/utils.py

Line 375 in e6305f3

"Install it with: pip install go-slug"

there's a go-based go-slug that HashiCorp offers, but it doesn't appear to have any kind of python/pip wrapper that would support pip install go-slug