v2.0 Support EC/DSA crypto #183

Job	Run time
rubocop	9s
Unit test (ubuntu-20.04, 3)	40s
Unit test (ubuntu-20.04, 3.1)	38s
Unit test (ubuntu-20.04, 3.2)	36s
Unit test (ubuntu-20.04, 3.3)	37s
Unit test (ubuntu-20.04, jruby-9.4)	1m 7s
Unit test (ubuntu-20.04, truffleruby)	2m 19s
Unit test (macos-latest, 3)	40s
Unit test (macos-latest, 3.1)	39s
Unit test (macos-latest, 3.2)	50s
Unit test (macos-latest, 3.3)	37s
Unit test (macos-latest, jruby-9.4)	1m 1s
Unit test (macos-latest, truffleruby)	1m 36s
Unit test (windows-latest, 3)	3m 36s
Unit test (windows-latest, 3.1)	1m 55s
Unit test (windows-latest, 3.2)	1m 31s
Unit test (windows-latest, 3.3)	2m 6s
finish	2s
	20m 39s

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