Simplify bitset default, typedefs are not allowed

[jwillemsen]

* ridlbe/c++11/visitors/bitset.rb:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.90%. Comparing base (65ca4a2) to head (0621475).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #414   +/-   ##
=======================================
  Coverage   59.90%   59.90%           
=======================================
  Files         605      605           
  Lines       48567    48567           
  Branches     4297     4297           
=======================================
  Hits        29093    29093           
  Misses      16281    16281           
  Partials     3193     3193           

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