proguard 3.0.0

Basic proguard mapping file handling for Rust
Documentation 
# Changelog

## 3.0.0

- Update `uuid` to `0.8.1`.

## 2.0.0

- Implement support for R8.
- Update `uuid` to `0.7.2`.

## 1.1.0

- Update `uuid` to `0.6.0`.

## 1.0.0

- Initial stable release.