Remove draft versions 32 and 34 from README

[bt90]

#3217 removed support for draft versions 32 and 34.

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[bt90]

@googlebot I signed it!

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[codecov]

Codecov Report

Merging #3244 (0178f70) into master (8906148) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3244   +/-   ##
=======================================
  Coverage   85.43%   85.43%           
=======================================
  Files         133      133           
  Lines        9803     9803           
=======================================
  Hits         8375     8375           
  Misses       1053     1053           
  Partials      375      375           

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