Allow setting defaults for SnakeYAML limits #235

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.5, 0.1.7, /tmp/local)	57s
build (2.5, 0.1.7)	31s
build (2.5, 0.2.5, /tmp/local)	1m 2s
build (2.5, 0.2.5)	41s
build (2.6, 0.1.7, /tmp/local)	1m 4s
build (2.6, 0.1.7)	34s
build (2.6, 0.2.5, /tmp/local)	1m 11s
build (2.6, 0.2.5)	34s
build (2.7, 0.1.7, /tmp/local)	1m 2s
build (2.7, 0.1.7)	38s
build (2.7, 0.2.5, /tmp/local)	1m 1s
build (2.7, 0.2.5)	37s
build (3.0, 0.1.7, /tmp/local)	33s
build (3.0, 0.1.7)	17s
build (3.0, 0.2.5, /tmp/local)	35s
build (3.0, 0.2.5)	33s
build (3.1, 0.1.7, /tmp/local)	25s
build (3.1, 0.1.7)	56s
build (3.1, 0.2.5, /tmp/local)	26s
build (3.1, 0.2.5)	38s
build (3.2, 0.1.7, /tmp/local)	37s
build (3.2, 0.1.7)	24s
build (3.2, 0.2.5, /tmp/local)	54s
build (3.2, 0.2.5)	31s
build (head, 0.1.7, /tmp/local)	32s
build (head, 0.1.7)	31s
build (head, 0.2.5, /tmp/local)	31s
build (head, 0.2.5)	17s
	18m 35s

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