Fix breakage caused by reason arguments #1027

Job	Run time
Rustfmt	11s
Build docs	1m 27s
Test (MSRV)	1m 13s
Clippy	52s
Test (stable)	2m 8s
Test (beta)	1m 59s
Test (nightly)	2m 4s
Test (macOS)	3m 15s
Test (Windows)	4m 18s
Test (no features)	1m 15s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 20s
	20m 2s

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