Include all contents of wpt folder in sdist

[jerivas]

It looks like the file wptScript.js is not included in the version of bikeshed available in PyPI, which results in the following error:

File "/home/jerivas/.virtualenvs/bike2/lib/python3.9/site-packages/bikeshed/wpt/wptElement.py", line 447, in getWptScript
    with open(config.scriptPath("wpt", "wptScript.js"), "r", encoding="utf-8") as fh:
FileNotFoundError: [Errno 2] No such file or directory: '/home/jerivas/.virtualenvs/bike2/lib/python3.9/site-packages/bikeshed/wpt/wptScript.js'

Steps to reproduce

I found this problem when trying to process a CSS working group spec:

pip install bikeshed==3.3.1
curl https://raw.githubusercontent.com/w3c/csswg-drafts/main/cssom-1/Overview.bs
bikeshed

[tabatkins]

Ahhhh, indeed, sorry about that. thanks!

[tabatkins]

I'll cut a new version this afternoon.