build

Bump version to 1.15.1 #4319

Job	Run time
lint	15s
Debug compatibility test	5m 51s
ruby-versions / Generate Ruby versions	2s
rake test 2.7 (latest reline)	1m 39s
rake test 2.7	1m 38s
vterm-yamatanooroti 2.7 (latest reline)	47s
rake test 3.0 (latest reline)	1m 37s
vterm-yamatanooroti 2.7	48s
rake test 3.0	1m 35s
vterm-yamatanooroti 3.0 (latest reline)	34s
rake test 3.1 (latest reline)	1m 43s
vterm-yamatanooroti 3.0	37s
rake test 3.1	1m 43s
vterm-yamatanooroti 3.1 (latest reline)	35s
rake test 3.2 (latest reline)	1m 33s
rake test 3.2	1m 40s
vterm-yamatanooroti 3.1	37s
rake test 3.3 (latest reline)	1m 46s
vterm-yamatanooroti 3.2 (latest reline)	36s
rake test 3.3	1m 49s
vterm-yamatanooroti 3.2	32s
rake test 3.4 (latest reline)	2m 16s
vterm-yamatanooroti 3.3 (latest reline)	34s
rake test 3.4	2m 16s
vterm-yamatanooroti 3.3	35s
rake test head (latest reline)	2m 1s
vterm-yamatanooroti 3.4 (latest reline)	36s
rake test head	1m 57s
vterm-yamatanooroti 3.4	37s
vterm-yamatanooroti head (latest reline)	33s
vterm-yamatanooroti head	41s
	40m 3s

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