fix: cookie-av allows arbitrary casing #58

Job	Run time
test (ubuntu-20.04, 2.0.0, Gemfile.rack-1.x)	9s
test (ubuntu-20.04, 2.1, Gemfile.rack-1.x)	12s
test (ubuntu-20.04, 2.3, Gemfile)	23s
test (ubuntu-20.04, 2.3, Gemfile.rack-1.x)	23s
test (ubuntu-20.04, 2.4, Gemfile)	19s
test (ubuntu-20.04, 2.4, Gemfile.rack-1.x)	21s
test (ubuntu-20.04, 2.5, Gemfile)	17s
test (ubuntu-20.04, 2.5, Gemfile.rack-1.x)	18s
test (ubuntu-20.04, 2.6, Gemfile)	19s
test (ubuntu-20.04, 2.6, Gemfile.rack-1.x)	26s
test (ubuntu-20.04, 2.7, Gemfile)	22s
test (ubuntu-20.04, 2.7, Gemfile.rack-1.x)	20s
test (ubuntu-20.04, 3.0, Gemfile)	5s
test (ubuntu-20.04, 3.0, Gemfile.rack-1.x)	6s
test (ubuntu-20.04, 3.1, Gemfile)	7s
test (ubuntu-20.04, 3.1, Gemfile.rack-1.x)	5s
test (ubuntu-20.04, 3.2, Gemfile)	12s
test (ubuntu-20.04, 3.2, Gemfile.rack-1.x)	7s
test (ubuntu-20.04, 3.3, Gemfile)	7s
test (ubuntu-20.04, 3.3, Gemfile.rack-1.x)	6s
test (ubuntu-20.04, jruby-9.3, Gemfile)	27s
test (ubuntu-20.04, jruby-9.3, Gemfile.rack-1.x)	28s
test (ubuntu-20.04, jruby-9.4, Gemfile)	39s
test (ubuntu-20.04, jruby-9.4, Gemfile.rack-1.x)	34s
	6m 52s

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