[READY] v2.0: Support DSA and ECDSA signing keys #368

Job	Run time
rubocop	12s
Unit test (ubuntu-20.04, 3)	1m 41s
Unit test (ubuntu-20.04, 3.1)	1m 46s
Unit test (ubuntu-20.04, 3.2)	1m 49s
Unit test (ubuntu-20.04, 3.3)	1m 48s
Unit test (ubuntu-20.04, jruby-9.4)	2m 32s
Unit test (ubuntu-20.04, truffleruby)	3m 41s
Unit test (macos-latest, 3)	1m 43s
Unit test (macos-latest, 3.1)	1m 34s
Unit test (macos-latest, 3.2)	1m 35s
Unit test (macos-latest, 3.3)	1m 44s
Unit test (macos-latest, jruby-9.4)	2m 1s
Unit test (macos-latest, truffleruby)	2m 37s
Unit test (windows-latest, 3)	4m 4s
Unit test (windows-latest, 3.1)	3m 2s
Unit test (windows-latest, 3.2)	3m 16s
Unit test (windows-latest, 3.3)	3m 13s
finish	4s
	38m 22s

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