Remove unused diff-colors.svg #476

Job	Run time
collect-release-info	12s
analyze	38s
collect-docsite-release-info	2s
unpublish_docsite	0s
build-docsite	27s
test (3.0, rails_6_1, rspec_lt_3_10)	2m 3s
test (3.0, rails_6_1, rspec_gte_3_10)	2m 4s
test (3.0, rails_7_0, rspec_lt_3_10)	1m 58s
test (3.0, rails_7_0, rspec_gte_3_10)	2m 6s
test (3.0, no_rails, rspec_lt_3_10)	1m 34s
test (3.0, no_rails, rspec_gte_3_10)	1m 35s
test (3.1, rails_6_1, rspec_lt_3_10)	2m 6s
test (3.1, rails_6_1, rspec_gte_3_10)	2m 6s
test (3.1, rails_7_0, rspec_lt_3_10)	2m 7s
test (3.1, rails_7_0, rspec_gte_3_10)	2m 3s
test (3.1, no_rails, rspec_lt_3_10)	1m 39s
test (3.1, no_rails, rspec_gte_3_10)	1m 38s
test (3.2, rails_6_1, rspec_lt_3_10)	2m 3s
test (3.2, rails_6_1, rspec_gte_3_10)	2m 2s
test (3.2, rails_7_0, rspec_lt_3_10)	2m 8s
test (3.2, rails_7_0, rspec_gte_3_10)	1m 59s
test (3.2, no_rails, rspec_lt_3_10)	1m 32s
test (3.2, no_rails, rspec_gte_3_10)	1m 37s
test (3.3, rails_6_1, rspec_lt_3_10)	2m 5s
test (3.3, rails_6_1, rspec_gte_3_10)	2m 3s
test (3.3, rails_7_0, rspec_lt_3_10)	2m 5s
test (3.3, rails_7_0, rspec_gte_3_10)	2m 5s
test (3.3, no_rails, rspec_lt_3_10)	1m 37s
test (3.3, no_rails, rspec_gte_3_10)	1m 31s
publish-docsite	6s
ready-to-merge	1s
	47m 12s

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