Merge pull request #12 from davidhewitt/release-0.12.1

Release 0.12.1

Author: davidhewitt

CHANGELOG.md

@@ -1,5 +1,8 @@
-## Unreleased
+## 0.12.1 - 2020-12-08
  - Require `std` feature of `serde`.
+ - Reduce memory consumption when deserializing sequences.
+ - Fix deserializing untagged struct enum variants.
+ - Fix deserializing sequences from Python tuples.
 
 ## 0.12.0 - 2020-11-22
 - Change release versioning to match `pyo3` major/minor version.