Bump up 5.2.0.beta1 #312

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (2.5, 0.1.7, /tmp/local)	44s
build (2.5, 0.1.7)	29s
build (2.5, 0.2.5, /tmp/local)	49s
build (2.5, 0.2.5)	32s
build (2.6, 0.1.7, /tmp/local)	54s
build (2.6, 0.1.7)	58s
build (2.6, 0.2.5, /tmp/local)	48s
build (2.6, 0.2.5)	29s
build (2.7, 0.1.7, /tmp/local)	48s
build (2.7, 0.1.7)	28s
build (2.7, 0.2.5, /tmp/local)	59s
build (2.7, 0.2.5)	29s
build (3.0, 0.1.7, /tmp/local)	24s
build (3.0, 0.1.7)	29s
build (3.0, 0.2.5, /tmp/local)	30s
build (3.0, 0.2.5)	24s
build (3.1, 0.1.7, /tmp/local)	49s
build (3.1, 0.1.7)	37s
build (3.1, 0.2.5, /tmp/local)	25s
build (3.1, 0.2.5)	27s
build (3.2, 0.1.7, /tmp/local)	23s
build (3.2, 0.1.7)	15s
build (3.2, 0.2.5, /tmp/local)	26s
build (3.2, 0.2.5)	25s
build (3.3, 0.1.7, /tmp/local)	31s
build (3.3, 0.1.7)	15s
build (3.3, 0.2.5, /tmp/local)	38s
build (3.3, 0.2.5)	46s
build (head, 0.1.7, /tmp/local)	39s
build (head, 0.1.7)	33s
build (head, 0.2.5, /tmp/local)	20s
build (head, 0.2.5)	23s
	18m 10s

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