Remove magic from autocomplete (#312) #1179

Job	Run time
Build docs	2m 38s
Clippy	59s
Rustfmt	6s
Test (MSRV)	1m 20s
Test (stable)	2m 3s
Test (beta)	2m 5s
Test (nightly)	1m 45s
Test (macOS)	1m 39s
Test (Windows)	5m 34s
Test (no features)	1m 11s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 12s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 19s
	21m 51s

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