Prepare release 1.16.0 #198

Job	Run time
Unit test (ubuntu-20.04, 2.1.9)	1m 27s
Unit test (ubuntu-20.04, 2.2.10)	1m 17s
Unit test (ubuntu-20.04, 2.3.8)	1m 14s
Unit test (ubuntu-20.04, 2.4.6)	1m 12s
Unit test (ubuntu-20.04, 2.5.8)	40s
Unit test (ubuntu-20.04, 2.6.6)	42s
Unit test (ubuntu-20.04, 2.7.2)	33s
Unit test (ubuntu-20.04, 3.0.1)	18s
Unit test (ubuntu-20.04, 3.1)	20s
Unit test (ubuntu-20.04, 3.2)	19s
Unit test (ubuntu-20.04, jruby-9.1.17.0)	1m 34s
Unit test (ubuntu-20.04, jruby-9.2.17.0)	1m 31s
Unit test (ubuntu-20.04, jruby-9.3.2.0)	1m 5s
Unit test (ubuntu-20.04, jruby-9.4.0.0)	1m 9s
Unit test (ubuntu-20.04, truffleruby)	2m 27s
Unit test (macos-latest, 2.1.9)	1m 49s
Unit test (macos-latest, 2.2.10)	2m 11s
Unit test (macos-latest, 2.3.8)	2m 20s
Unit test (macos-latest, 2.4.6)	2m 6s
Unit test (macos-latest, 2.5.8)	1m 28s
Unit test (macos-latest, 2.6.6)	1m 2s
Unit test (macos-latest, 2.7.2)	1m 0s
Unit test (macos-latest, 3.0.1)	43s
Unit test (macos-latest, 3.1)	35s
Unit test (macos-latest, 3.2)	1m 0s
Unit test (macos-latest, jruby-9.1.17.0)	1m 3s
Unit test (macos-latest, jruby-9.2.17.0)	1m 57s
Unit test (macos-latest, jruby-9.3.2.0)	53s
Unit test (macos-latest, jruby-9.4.0.0)	1m 4s
Unit test (macos-latest, truffleruby)	10m 41s
finish	0s
	45m 40s

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