Upgrade string formatting.

[wRAR]

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[codecov]

Codecov Report

Attention: Patch coverage is 94.02985% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.08%. Comparing base (58b436f) to head (24c5e09).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cssselect/parser.py	94.28%	2 Missing ⚠️
cssselect/xpath.py	93.75%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   96.09%   96.08%   -0.01%     
==========================================
  Files           3        3              
  Lines         896      895       -1     
  Branches      142      141       -1     
==========================================
- Hits          861      860       -1     
  Misses         14       14              
  Partials       21       21              

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