Support automatically declaring type based on the number of flags

[m-peko]

No description provided.

[codecov-commenter]

Codecov Report

Merging #11 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #11   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           85        85           
=========================================
  Hits            85        85           

Impacted Files	Coverage Δ
tests/src/bitflags_test.cpp	100.00% <ø> (ø)
include/bitflags/bitflags.hpp	100.00% <100.00%> (ø)

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