allow sqlite3 gem to float to version 2 #435

Job	Run time
lint	22s
test (2.1, gems/rails3.gemfile)	20s
test (2.2)	21s
test (2.3)	19s
test (2.4)	16s
test (2.5)	17s
test (2.6)	19s
test (2.6, gems/typhoeus.gemfile, typhoeus)	21s
test (2.6, gems/octoshark.gemfile)	21s
test (2.6, gems/rails3.gemfile, 1.17.3)	23s
test (2.7)	1m 33s
test (2.7, true)	1m 30s
test (3.0)	16s
test (3.0, true)	13s
test (3.0, gems/instruments.gemfile, instruments)	14s
test (3.0, gems/instruments.gemfile, true, instruments)	12s
test (3.0, gems/sidekiq.gemfile, sidekiq_install)	19s
test (3.1)	14s
test (3.2)	20s
	8m 10s

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