Handle `\n` in MIME::Types.type_for #66

Job	Run time
test (macos-latest, 2.6)	1m 14s
test (macos-latest, 2.7)	1m 9s
test (macos-latest, 3.0)	36s
test (macos-latest, 3.1)	40s
test (macos-latest, 3.2)	32s
test (macos-latest, head)	45s
test (macos-latest, jruby)	2m 47s
test (macos-latest, jruby-head)	2m 39s
test (macos-latest, truffleruby)	1m 55s
test (macos-latest, truffleruby+graalvm)	4m 42s
test (ubuntu-20.04, 2.6)	42s
test (ubuntu-20.04, 2.7)	49s
test (ubuntu-20.04, 3.0)	25s
test (ubuntu-20.04, 3.1)	27s
test (ubuntu-20.04, 3.2)	18s
test (ubuntu-20.04, head)	25s
test (ubuntu-20.04, jruby)	1m 27s
test (ubuntu-20.04, jruby-head)	1m 20s
test (ubuntu-20.04, truffleruby)	1m 14s
test (ubuntu-20.04, truffleruby+graalvm)	1m 50s
test (windows-latest, mingw)	1m 16s
test (windows-latest, mswin)	1m 39s
test (windows-latest, jruby, true)	4m 36s
test (ubuntu-22.04, head)	21s
test (ubuntu-22.04, 3.1)	24s
test (ubuntu-22.04, 3.2)	30s
test (ubuntu-22.04, truffleruby+graalvm-head, true)	6s
test (ubuntu-22.04, truffleruby-head, true)	1m 57s
	36m 45s

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