Update URLs to use https:// where available

[jdufresne]

No description provided.

[codecov]

Codecov Report

Merging #432 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #432   +/-   ##
=======================================
  Coverage   78.29%   78.29%           
=======================================
  Files          14       14           
  Lines         751      751           
  Branches      108      108           
=======================================
  Hits          588      588           
+ Misses        130      129    -1     
- Partials       33       34    +1

Impacted Files	Coverage Δ
twine/utils.py	83.68% <ø> (ø)	⬆️
twine/settings.py	93.1% <ø> (ø)	⬆️
twine/package.py	86.72% <ø> (ø)	⬆️
twine/repository.py	60.57% <ø> (ø)	⬆️
twine/wheel.py	85.18% <ø> (ø)	⬆️
twine/commands/__init__.py	100% <ø> (ø)	⬆️
twine/cli.py	100% <ø> (ø)	⬆️
twine/commands/upload.py	75% <ø> (ø)	⬆️
twine/exceptions.py	100% <ø> (ø)	⬆️
twine/commands/register.py	0% <ø> (ø)	⬆️
... and 3 more

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