Fix credentials validation, remove default values, and disallow extra fields

[cortadocodes]

Contents

Breaking changes

• [x] Disallow default values for credentials
• [x] Disallow extra fields in credentials strand of twine.json
• [x] Return set of names of validated credentials from Twine.validate_credentials (not their values)

Minor fixes and improvements

• [x] Add *args and **kwargs to Twine.validate_credentials to ignore extra arguments from Twine.validate (this was causing errors)

[codecov[bot]]

Codecov Report

Merging #73 (81bf537) into release/0.0.17 (00b1547) will decrease coverage by 0.12%. The diff coverage is 100.00%.

@@                Coverage Diff                 @@
##           release/0.0.17      #73      +/-   ##
==================================================
- Coverage           85.95%   85.83%   -0.13%     
==================================================
  Files                   7        7              
  Lines                 235      233       -2     
==================================================
- Hits                  202      200       -2     
  Misses                 33       33              

Impacted Files	Coverage Δ
twined/twine.py	78.57% <100.00%> (-0.28%)	:arrow_down:

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