Use Enumerable#min instead of defined module function.

[fortissimo1997]

I think Enumerable#min is more well-known and useful method than using self defined method.

[yuki24]

Thanks for the request! Actually I'm aware of #min but intentionally left #min3 for performance reasons. In fact, the commit on rubygems/rubygems@a7b2c2d is the exact opposite change of yours. Does it make sense?

[fortissimo1997]

Thanks for your reply with detailed reason of current implementation!
I've just measured the performance of each version,
#min3 version is faster!
I'll close this request.

Current version

pry(main)> Benchmark.measure { 10000.times { DidYouMean::Levenshtein.distance("method_missing", "method_mising") } }
=>   0.970000   0.000000   0.970000 (  0.970087)

Enumerable#min version

pry(main)> Benchmark.measure { 10000.times { DidYouMean::Levenshtein.distance("method_missing", "method_mising") } }
=>   1.630000   0.000000   1.630000 (  1.631267)