Fix missing link to mime-types-data gem in README #77

Job	Run time
Ruby 2.6 - macos-latest	1m 10s
Ruby 2.7 - macos-latest	1m 26s
Ruby 3.0 - macos-latest	42s
Ruby 3.1 - macos-latest	37s
Ruby 3.2 - macos-latest	58s
Ruby 3.3 - macos-latest	1m 4s
Ruby head - macos-latest	30s
Ruby jruby - macos-latest	2m 26s
Ruby jruby-head - macos-latest	1m 58s
Ruby truffleruby - macos-latest	1m 33s
Ruby truffleruby+graalvm - macos-latest	10m 13s
Ruby 2.6 - ubuntu-20.04	34s
Ruby 2.7 - ubuntu-20.04	34s
Ruby 3.0 - ubuntu-20.04	24s
Ruby 3.1 - ubuntu-20.04	26s
Ruby 3.2 - ubuntu-20.04	20s
Ruby 3.3 - ubuntu-20.04	26s
Ruby head - ubuntu-20.04	17s
Ruby jruby - ubuntu-20.04	1m 28s
Ruby jruby-head - ubuntu-20.04	1m 30s
Ruby truffleruby - ubuntu-20.04	58s
Ruby truffleruby+graalvm - ubuntu-20.04	4m 0s
Ruby mingw - windows-latest	1m 52s
Ruby mswin - windows-latest	4m 8s
Ruby jruby - windows-latest	3m 24s
Ruby head - ubuntu-22.04	16s
Ruby 3.1 - ubuntu-22.04	23s
Ruby 3.2 - ubuntu-22.04	23s
Ruby 3.3 - ubuntu-22.04	36s
Ruby truffleruby+graalvm-head - ubuntu-22.04	4m 17s
Ruby truffleruby-head - ubuntu-22.04	1m 9s
	50m 2s

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