Fix pdfchecker download URL - close #530

[Lucas-C]

No description provided.

[codecov]

Codecov Report

Merging #533 (be27bbb) into master (d6f4425) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #533      +/-   ##
==========================================
- Coverage   94.09%   93.96%   -0.14%     
==========================================
  Files          22       22              
  Lines        6200     6064     -136     
  Branches     1263     1229      -34     
==========================================
- Hits         5834     5698     -136     
  Misses        191      191              
  Partials      175      175              

Impacted Files	Coverage Δ
fpdf/prefs.py	90.90% <0.00%> (-1.95%)	⬇️
fpdf/drawing.py	92.73% <0.00%> (-0.28%)	⬇️
fpdf/syntax.py	95.37% <0.00%> (-0.05%)	⬇️
fpdf/fpdf.py	92.56% <0.00%> (-0.01%)	⬇️
fpdf/sign.py	100.00% <0.00%> (ø)
fpdf/enums.py	100.00% <0.00%> (ø)
fpdf/__init__.py	100.00% <0.00%> (ø)

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