upload_appveyor_builds.py does not work with twine >= 1.6.0

[dahlia]

Downloading dist/libsass-0.9.1-cp27-none-win32.whl...
Downloading dist/libsass-0.9.1-cp27-none-win_amd64.whl...
Downloading dist/libsass-0.9.1-cp33-none-win32.whl...
Downloading dist/libsass-0.9.1-cp33-none-win_amd64.whl...
Downloading dist/libsass-0.9.1-cp34-none-win32.whl...
Downloading dist/libsass-0.9.1-cp34-none-win_amd64.whl...
Uploading 6 file(s)...
Traceback (most recent call last):
  File "./upload_appveyor_builds.py", line 140, in <module>
    main()
  File "./upload_appveyor_builds.py", line 135, in main
    dists=dists
TypeError: upload() missing 2 required positional arguments: 'config_file' and 'skip_existing'

Twine seems change their internal API since 1.6.0.

[asottile]

I've got this :)

[dahlia]

👍