[Matcher] Update contextable to match validatable changes (#234) #307

Job	Run time
minitest (3.0, rails_6_1_3_1, vips)	34s
minitest (3.0, rails_6_1_3_1, mini_magick)	37s
minitest (3.0, rails_7_0, vips)	32s
minitest (3.0, rails_7_0, mini_magick)	39s
minitest (3.0, rails_7_1, vips)	26s
minitest (3.0, rails_7_1, mini_magick)	35s
minitest (3.0, rails_next, vips)	28s
minitest (3.0, rails_next, mini_magick)	39s
minitest (3.1, rails_7_0, vips)	24s
minitest (3.1, rails_7_0, mini_magick)	29s
minitest (3.1, rails_7_1, vips)	30s
minitest (3.1, rails_7_1, mini_magick)	31s
minitest (3.1, rails_next, vips)	24s
minitest (3.1, rails_next, mini_magick)	32s
minitest (3.2, rails_7_0, vips)	22s
minitest (3.2, rails_7_0, mini_magick)	27s
minitest (3.2, rails_7_1, vips)	30s
minitest (3.2, rails_7_1, mini_magick)	35s
minitest (3.2, rails_next, vips)	34s
minitest (3.2, rails_next, mini_magick)	39s
	10m 27s

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