Bump up v5.2.0 #340

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.5, 0.1.7, /tmp/local)	56s
build (2.5, 0.1.7)	27s
build (2.5, 0.2.5, /tmp/local)	47s
build (2.5, 0.2.5)	38s
build (2.6, 0.1.7, /tmp/local)	1m 14s
build (2.6, 0.1.7)	54s
build (2.6, 0.2.5, /tmp/local)	58s
build (2.6, 0.2.5)	45s
build (2.7, 0.1.7, /tmp/local)	52s
build (2.7, 0.1.7)	27s
build (2.7, 0.2.5, /tmp/local)	1m 4s
build (2.7, 0.2.5)	43s
build (3.0, 0.1.7, /tmp/local)	38s
build (3.0, 0.1.7)	40s
build (3.0, 0.2.5, /tmp/local)	23s
build (3.0, 0.2.5)	15s
build (3.1, 0.1.7, /tmp/local)	21s
build (3.1, 0.1.7)	15s
build (3.1, 0.2.5, /tmp/local)	23s
build (3.1, 0.2.5)	18s
build (3.2, 0.1.7, /tmp/local)	37s
build (3.2, 0.1.7)	29s
build (3.2, 0.2.5, /tmp/local)	27s
build (3.2, 0.2.5)	24s
build (3.3, 0.1.7, /tmp/local)	23s
build (3.3, 0.1.7)	18s
build (3.3, 0.2.5, /tmp/local)	21s
build (3.3, 0.2.5)	30s
build (head, 0.1.7, /tmp/local)	33s
build (head, 0.1.7)	17s
build (head, 0.2.5, /tmp/local)	34s
build (head, 0.2.5)	31s
	18m 24s

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