Fix multiline string diff with blank lines #489

Job	Run time
collect-release-info	11s
analyze	36s
collect-docsite-release-info	5s
unpublish_docsite	0s
test (3.0, rails_6_1, rspec_lt_3_10)	1m 57s
build-docsite	0s
test (3.0, rails_6_1, rspec_gte_3_10)	1m 59s
test (3.0, rails_7_0, rspec_lt_3_10)	1m 53s
test (3.0, rails_7_0, rspec_gte_3_10)	2m 1s
test (3.0, no_rails, rspec_lt_3_10)	1m 32s
test (3.0, no_rails, rspec_gte_3_10)	1m 36s
test (3.1, rails_6_1, rspec_lt_3_10)	2m 13s
test (3.1, rails_6_1, rspec_gte_3_10)	2m 2s
test (3.1, rails_7_0, rspec_lt_3_10)	2m 3s
test (3.1, rails_7_0, rspec_gte_3_10)	2m 13s
test (3.1, no_rails, rspec_lt_3_10)	1m 37s
test (3.1, no_rails, rspec_gte_3_10)	1m 40s
test (3.2, rails_6_1, rspec_lt_3_10)	2m 6s
test (3.2, rails_6_1, rspec_gte_3_10)	2m 9s
test (3.2, rails_7_0, rspec_lt_3_10)	2m 1s
test (3.2, rails_7_0, rspec_gte_3_10)	2m 13s
test (3.2, no_rails, rspec_lt_3_10)	1m 40s
test (3.2, no_rails, rspec_gte_3_10)	1m 39s
publish-docsite	0s
test (3.3, rails_6_1, rspec_lt_3_10)	2m 8s
test (3.3, rails_6_1, rspec_gte_3_10)	2m 17s
test (3.3, rails_7_0, rspec_lt_3_10)	2m 7s
test (3.3, rails_7_0, rspec_gte_3_10)	2m 5s
test (3.3, no_rails, rspec_lt_3_10)	1m 32s
test (3.3, no_rails, rspec_gte_3_10)	1m 33s
ready-to-merge	1s
	47m 9s

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