Add Enumerable#filter_map since Ruby 2.7 #2264
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#2071
Ruby 2.7から追加された Enumerable#filter_map のドキュメントを追加します。
RDoc: https://docs.ruby-lang.org/en/master/Enumerable.html#method-i-filter_map
サンプルコードはRDocから持ってきています。