Use @actions-rs/core for cargo/cross execution.

Add problem matcher for cargo output

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Problem matcher which will highlight warnings and errors in the cargo output
+
+### Changed
+
+- Use `@action-rs/core` package for cargo/cross execution
+
+## [1.0.1] - 2019-09-15
+
+### Added
+
+- First public version