Bump version to 3.0.0 #35

Job	Run time
stable (3.2, gemfiles/rails_70.gemfile)	12s
stable (3.1, gemfiles/rails_70.gemfile)	21s
stable (3.1, gemfiles/rails_61.gemfile)	17s
stable (3.0, gemfiles/rails_70.gemfile)	19s
stable (3.0, gemfiles/rails_61.gemfile)	13s
stable (3.0, gemfiles/rails_60.gemfile)	14s
stable (2.7, gemfiles/rails_61.gemfile)	30s
stable (2.7, gemfiles/rails_60.gemfile)	35s
stable (2.6, gemfiles/rails_61.gemfile)	33s
stable (2.6, gemfiles/rails_60.gemfile)	34s
stable (2.6, gemfiles/rails_52.gemfile)	45s
stable (2.6, gemfiles/rails_51.gemfile)	31s
stable (2.6, gemfiles/rails_50.gemfile)	33s
stable (2.5, gemfiles/rails_61.gemfile)	39s
stable (2.5, gemfiles/rails_60.gemfile)	31s
stable (2.5, gemfiles/rails_52.gemfile)	29s
stable (2.5, gemfiles/rails_51.gemfile)	39s
stable (2.5, gemfiles/rails_50.gemfile)	38s
stable (2.5, gemfiles/rails_42.gemfile)	33s
stable (jruby-9.3, gemfiles/rails_61.gemfile)	1m 18s
stable (jruby-9.3, gemfiles/rails_60.gemfile)	1m 15s
stable (jruby-9.3, gemfiles/rails_52.gemfile)	1m 14s
stable (jruby-9.4, gemfiles/rails_70.gemfile)	1m 19s
stable (jruby-9.4, gemfiles/rails_61.gemfile)	1m 18s
ruby_edge (ruby-head, gemfiles/rails_edge.gemfile)	21s
rails_edge	24s
ruby_edge (ruby-head, gemfiles/rails_70.gemfile)	18s
ruby_edge (jruby-head, gemfiles/rails_edge.gemfile)	2m 21s
ruby_edge (jruby-head, gemfiles/rails_70.gemfile)	1m 30s
	20m 24s

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