Vendor dependencies for 0.3.0 release

vendor/arrayvec/README.md

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+
+arrayvec
+========
+[![Crates.io: arrayvec](https://img.shields.io/crates/v/arrayvec.svg)](https://crates.io/crates/arrayvec)
+[![Documentation](https://docs.rs/arrayvec/badge.svg)](https://docs.rs/arrayvec)
+[![Build Status](https://github.com/bluss/arrayvec/workflows/Continuous%20integration/badge.svg?branch=master)](https://github.com/bluss/arrayvec/actions)
+
+
+
+
+[![License: Apache](https://img.shields.io/badge/License-Apache%202.0-red.svg)](LICENSE-APACHE)
+OR
+[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+
+A vector with fixed capacity.
+
+Please read the [`API documentation here`](https://docs.rs/arrayvec)
+
+# License
+
+Dual-licensed to be compatible with the Rust project.
+
+Licensed under the Apache License, Version 2.0
+http://www.apache.org/licenses/LICENSE-2.0 or the MIT license
+http://opensource.org/licenses/MIT, at your
+option. This file may not be copied, modified, or distributed
+except according to those terms.