Tests

update changelog and bump version to 5.5.0 (#520) #527

Job	Run time
lint	1m 46s
test (2.5)	1m 47s
test (2.6)	1m 47s
test (2.6, gems/typhoeus.gemfile, typhoeus)	1m 51s
test (2.6, gems/octoshark.gemfile)	2m 4s
test (2.7)	1m 51s
test (2.7, true)	1m 53s
test (3.0)	22s
test (3.0, true)	24s
test (3.0, gems/instruments.gemfile, instruments)	25s
test (3.0, gems/instruments.gemfile, true, instruments)	25s
test (3.0, gems/sidekiq.gemfile, sidekiq_install)	23s
test (3.1)	22s
test (3.2, gems/sqlite3-v2.gemfile)	25s
test (3.3, gems/sqlite3-v2.gemfile)	24s
	16m 9s

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