Json output upgrades #34

Job	Run time
Output Regression Test	4m 6s
Test with MIME database	3m 24s
Test x86_64-unknown-linux-gnu	3m 37s
Test Linux (latest stable Rust)	2m 18s
Test x86_64-apple-darwin	3m 49s
Actionlint	1m 14s
Rustfmt	1m 14s
Test x86_64-pc-windows-msvc	4m 10s
Check Linux Packaging	3m 49s
Test aarch64-unknown-linux-gnu	4m 51s
Test aarch64-apple-darwin	2m 48s
Test x86_64-unknown-linux-musl	4m 2s
	39m 22s

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