Bump up version to 3.0.2 #58

Job	Run time
test (ubuntu-latest, head)	11s
test (ubuntu-latest, 3.3)	14s
test (ubuntu-latest, 3.2)	12s
test (ubuntu-latest, 3.1)	12s
test (ubuntu-latest, 3.0)	15s
test (ubuntu-latest, jruby)	1m 2s
test (ubuntu-latest, jruby-head)	55s
test (ubuntu-latest, truffleruby)	27s
test (ubuntu-latest, truffleruby-head)	32s
test (ubuntu-latest, truffleruby+graalvm)	1m 31s
test (windows-latest, head)	1m 18s
test (windows-latest, 3.3)	2m 57s
test (windows-latest, mingw)	1m 4s
test (windows-latest, mswin)	1m 20s
test (windows-latest, ucrt)	1m 16s
test (macos-latest, head)	18s
test (macos-latest, 3.3)	12s
	13m 56s

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