Clean up
Use latest minitest-vcr and webmock
Add description of bestgems.org
Better snake_case converting
Use keyword arguments in constructor
Implement access rate limitation

This feature would be better to be implemented as Faraday middleware and
to use Faraday in BestGemsClient.
Add example using Enumerator::Lazy
Make gem["link"] absolute and declare BASE_URL
Add warning of imcompatible changes to README.md
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