Prevent underscore binding lint (#216) #896

Job	Run time
Clippy	1m 30s
Rustfmt	8s
Test (MSRV)	4m 32s
Build docs	3m 42s
Test (stable)	3m 54s
Test (beta)	2m 4s
Test (nightly)	2m 8s
Test (macOS)	6m 5s
Test (Windows)	8m 55s
Test (no features)	2m 25s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 51s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	2m 8s
	39m 22s

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