update changelog for release 0.7.21
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+# 0.7.21 - support native TLS certs
+
+* df715cd5 - feat: support native TLS. Fixes #144 (Matt Fellows, Mon Sep 20 13:00:33 2021 +1000)
+* c9165bd3 - bump version to 0.7.21 (Ronald Holshausen, Tue Aug 17 10:37:33 2021 +1000)
+
# 0.7.20 - Refactor
* 9baa714d - chore: bump minor version of matching crate (Ronald Holshausen, Fri Jul 23 14:03:20 2021 +1000)
