docs(changelog): add second-audit security fixes #328

Job	Run time
Default Features (batteries_included + v4)	1m 9s
Security Audit	2m 59s
Clippy (v2_local)	24s
Clippy (v1_public_insecure)	26s
Clippy (v3_public)	58s
Clippy (v2_public)	58s
Test Suite (v1_local)	55s
Test Suite (v1_public_insecure)	53s
Test Suite (v2_local)	47s
Test Suite (v4_public)	53s
Clippy (v4_local)	58s
Clippy (v1_local)	58s
Test Suite (v4_local)	46s
Test Suite (v2_public)	52s
Clippy (v4_public)	59s
Test Suite (v3_local)	54s
Test Suite (v3_public)	46s
Clippy (v3_local)	58s
Create Release	0s
	17m 33s

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