json schema added through opt schemars crate #130

Job	Run time
Lints	20s
Check (ubuntu-latest, stable)	10s
Test Suite (ubuntu-latest, stable)	27s
Check (ubuntu-latest, beta)	18s
Test Suite (ubuntu-latest, beta)	32s
Check (ubuntu-latest, nightly)	19s
Test Suite (ubuntu-latest, nightly)	35s
Check (macos-latest, stable)	47s
Test Suite (macos-latest, stable)	54s
Check (macos-latest, beta)	31s
Test Suite (macos-latest, beta)	57s
Check (macos-latest, nightly)	31s
Test Suite (macos-latest, nightly)	1m 47s
Check (windows-latest, stable)	1m 38s
Test Suite (windows-latest, stable)	1m 56s
Check (windows-latest, beta)	54s
Test Suite (windows-latest, beta)	1m 22s
Check (windows-latest, nightly)	56s
Test Suite (windows-latest, nightly)	1m 15s
	16m 9s

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