Fix breakage caused by reason arguments #1039

Job	Run time
Clippy	52s
Test (MSRV)	1m 13s
Rustfmt	12s
Test (stable)	2m 4s
Test (beta)	2m 0s
Build docs	1m 32s
Test (nightly)	2m 4s
Test (macOS)	1m 54s
Test (Windows)	4m 24s
Test (no features)	1m 14s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 21s
	18m 50s

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