Declare v0.5.0 support in README

[heavywatal]

Also https://github.com/toml-lang/toml/wiki should be updated.
Then there will be no more questions like #33 .

[codecov]

Codecov Report

Merging #35 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #35   +/-   ##
======================================
  Coverage    60.2%   60.2%           
======================================
  Files           3       3           
  Lines        1342    1342           
======================================
  Hits          808     808           
  Misses        534     534

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[eddelbuettel]

Thanks, done. I forget to update the README when the code was updated.

I also edited the upstream wiki accordingly -- thanks for catching that as well.