docs: update CHANGELOG for 0.12.1 (#220)

Forward-porting the changelog update from #219 to `main`.
rustls · Jan 26, 2024 · 30179f6 · 30179f6
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diff --git a/rcgen/CHANGELOG.md b/rcgen/CHANGELOG.md
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 # Changes
 
+## Release 0.12.1 - January 25th, 2024
+
+- RFC 5280 specifies that a serial number must not be larger than 20 octets in
+  length. Prior to this release an unintended interaction between rcgen and its
+  underlying DER encoding library could result in 21 octet serials. This has now
+  been fixed.
+- A regression that caused build errors when the optional `pem` feature was
+  omitted has been fixed.
+
 ## Release 0.12.0 - December 16, 2023
 
 - Rename `RcgenError` to `Error`. Contributed by [thomaseizinger](https://github.com/thomaseizinger).