build

Bump version to v1.15.0 (#1066) #4315

Job	Run time
Debug compatibility test	5m 56s
lint	15s
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	53s
rake test 2.7 (latest reline)	1m 45s
vterm-yamatanooroti 2.7	48s
rake test 2.7	1m 40s
rake test 3.0 (latest reline)	1m 38s
vterm-yamatanooroti 3.0 (latest reline)	38s
rake test 3.0	1m 45s
vterm-yamatanooroti 3.0	37s
rake test 3.1 (latest reline)	1m 49s
vterm-yamatanooroti 3.1 (latest reline)	39s
rake test 3.1	1m 46s
vterm-yamatanooroti 3.1	1m 30s
rake test 3.2 (latest reline)	1m 39s
vterm-yamatanooroti 3.2 (latest reline)	42s
rake test 3.2	1m 38s
vterm-yamatanooroti 3.2	30s
rake test 3.3 (latest reline)	1m 50s
vterm-yamatanooroti 3.3 (latest reline)	41s
rake test 3.3	1m 47s
vterm-yamatanooroti 3.3	41s
rake test 3.4 (latest reline)	2m 25s
vterm-yamatanooroti 3.4 (latest reline)	42s
rake test 3.4	2m 4s
vterm-yamatanooroti 3.4	35s
rake test head (latest reline)	2m 7s
vterm-yamatanooroti head (latest reline)	39s
rake test head	1m 56s
vterm-yamatanooroti head	40s
	42m 17s

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