Add blackjack and hookers to CHANGELOG.md #886

Job	Run time
Rustfmt	6s
Clippy	1m 17s
Test (MSRV)	6m 16s
Build docs	2m 44s
Test (stable)	3m 44s
Test (beta)	4m 1s
Test (nightly)	3m 18s
Test (macOS)	2m 37s
Test (Windows)	7m 19s
Test (no features)	2m 15s
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 18s
	37m 46s

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