Release 1.3.2

Update pyo3 to 1.3.1 and rustc to 1.50

Release 1.3.1

1. Use borrowed instead of owned string arguments to achieve ~10% more performance
2. Add retries to the win32 build step to workaround the bug in rust 1.49 (#6).

Version 1.3.0

Support for sub-second precision.

Version 1.2.1

Add a CI step to upload wheels to Github Releases.

Version 1.1.0.

• Update chrono and PyO3 to the latest versions
• Rewrite the library in stable Rust
• Update manylinux to 2010