Fix transitProviderWebsiteURL naming + deprecate old API (#672)

[drallgood]

fixes #672

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.37%. Comparing base (182553f) to head (12e3742).

❌ Your project status has failed because the head coverage (81.37%) is below the target coverage (85.00%). You can increase the head coverage or adjust the target coverage.
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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #673      +/-   ##
============================================
+ Coverage     80.61%   81.37%   +0.75%     
- Complexity      743      749       +6     
============================================
  Files            59       59              
  Lines          1646     1648       +2     
  Branches         58       58              
============================================
+ Hits           1327     1341      +14     
+ Misses          266      255      -11     
+ Partials         53       52       -1     

Flag	Coverage Δ
unittests	81.37% <100.00%> (+0.75%)	⬆️

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Files with missing lines	Coverage Δ
...t/src/main/java/de/brendamour/jpasskit/PKPass.java	96.66% <100.00%> (+0.05%)	⬆️
...ain/java/de/brendamour/jpasskit/PKPassBuilder.java	71.30% <100.00%> (+0.96%)	⬆️

... and 3 files with indirect coverage changes

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