List @olleolleolle as one of gem authors #18

Job	Run time
test (ubuntu-latest, 2.4)	32s
test (ubuntu-latest, 2.5)	41s
test (ubuntu-latest, 2.6)	48s
test (ubuntu-latest, 2.7)	36s
test (ubuntu-latest, 3.0)	28s
test (ubuntu-latest, 3.1)	22s
test (ubuntu-latest, 3.2)	26s
test (ubuntu-latest, jruby)	1m 44s
test (ubuntu-latest, truffleruby)	1m 0s
test (windows-latest, 2.4)	1m 42s
test (windows-latest, 2.5)	2m 41s
test (windows-latest, 2.6)	2m 55s
test (windows-latest, 2.7)	3m 19s
test (windows-latest, 3.0)	1m 43s
test (windows-latest, 3.1)	1m 37s
test (windows-latest, 3.2)	3m 24s
test (windows-latest, jruby)	2m 26s
	26m 24s

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