chore: release 0.3.0

[miraclx]

Following https://github.com/near/cargo-near/pull/90, PRs like these, once merged into master, automatically trigger a release.

Scheduled release: 10-11-2022

Changes:

• The minimum supported version of the SDK for this release is 4.1.0.
• Upgraded the near-abi version to 0.3.0. https://github.com/near/cargo-near/pull/83
• The exported and embedded ABI now includes build information. https://github.com/near/cargo-near/pull/55
• When building a contract, the exported ABI now also includes the code hash of the built contract. https://github.com/near/cargo-near/pull/55
• Fixed a situation where cargo-near could potentially run into segfaults when working with incompatible versions of the SDK. https://github.com/near/cargo-near/pull/74
• cargo-near now only accepts valid UTF-8 input from the CLI, and will error out if it encounters invalid UTF-8. https://github.com/near/cargo-near/pull/76
• cargo-near no longer requires explicitly activating the abi feature for the SDK. https://github.com/near/cargo-near/pull/85
• Fixed a bug where cargo-near exports an empty ABI file when the target directory is explicitly specified. https://github.com/near/cargo-near/pull/75
• Introduced build stages with a neat report interface. https://github.com/near/cargo-near/pull/59, https://github.com/near/cargo-near/pull/63, https://github.com/near/cargo-near/pull/69
• Added the --color flag to control the color output. https://github.com/near/cargo-near/pull/86
• Ensured all forwarded cargo output retains colors in it's report, maintaining tooling familiarity. https://github.com/near/cargo-near/pull/66
• Removed the buffering that made cargo's stdout lag behind its stderr. https://github.com/near/cargo-near/pull/65
• When building contracts, cargo's warnings are only emitted at the build stage, and not duplicated. https://github.com/near/cargo-near/pull/68
• Introduced the automated publishing workflow. https://github.com/near/cargo-near/pull/90