Fix clippy #1077

# to view logs

Job	Run time
MSRV	1m 2s
Test (nightly)	3m 3s
Build docs	56s
Examples	4m 25s
Test (macOS)	2m 10s
Check minimal versions	1m 4s
Test (stable)	2m 37s
Test (beta)	2m 53s
Test (Windows)	5m 53s
Test (native-tls)	2m 39s
Test (no default features)	56s
Test (no cache)	2m 37s
Test (no gateway)	1m 49s
Test (unstable Discord API features)	2m 54s
Test (simd-json)	2m 52s
Test (chrono, chrono)	1m 0s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 19s
Test (builder without model, builder, true)	42s
Test (unstable Discord API (no default features), unstable_discord_api, true)	44s
	41m 35s

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