build

Bump version to v1.15.0 #4307

Job	Run time
lint	12s
Debug compatibility test	5m 55s
ruby-versions / Generate Ruby versions	4s
rake test 2.7 (latest reline)	1m 40s
vterm-yamatanooroti 2.7 (latest reline)	44s
rake test 2.7	1m 43s
vterm-yamatanooroti 2.7	44s
rake test 3.0 (latest reline)	1m 36s
vterm-yamatanooroti 3.0 (latest reline)	47s
rake test 3.0	1m 39s
rake test 3.1 (latest reline)	1m 50s
vterm-yamatanooroti 3.0	42s
rake test 3.1	1m 54s
vterm-yamatanooroti 3.1 (latest reline)	1m 1s
rake test 3.2 (latest reline)	1m 35s
vterm-yamatanooroti 3.1	37s
rake test 3.2	1m 37s
vterm-yamatanooroti 3.2 (latest reline)	38s
vterm-yamatanooroti 3.2	40s
rake test 3.3 (latest reline)	1m 48s
vterm-yamatanooroti 3.3 (latest reline)	38s
rake test 3.3	1m 46s
vterm-yamatanooroti 3.3	41s
rake test 3.4 (latest reline)	2m 8s
vterm-yamatanooroti 3.4 (latest reline)	45s
rake test 3.4	2m 8s
vterm-yamatanooroti 3.4	43s
rake test head (latest reline)	2m 4s
vterm-yamatanooroti head (latest reline)	36s
rake test head	2m 6s
vterm-yamatanooroti head	42s
	41m 43s

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