Update proc-macro-crate requirement from 1.0.0 to 3.0.0 in /proc-macro-definitions #855

Job	Run time
Book	50s
Browser Test	1m 22s
Minimal Versions	37s
Check on Rust 1.58 (macos)	17s
Check on Rust stable (macos)	16s
Miri	33s
Check on Rust beta (macos)	15s
Check on Rust nightly (macos)	13s
Check on Rust 1.58 (ubuntu)	32s
Test	15s
Check on Rust stable (ubuntu)	14s
Check on Rust beta (ubuntu)	12s
Check on Rust nightly (ubuntu)	17s
Check on Rust 1.58 (windows)	17s
Check on Rust stable (windows)	1s
Check on Rust beta (windows)	11s
Check on Rust nightly (windows)	9s
	6m 31s

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