trpl 0.3.0

A support crate for The Rust Programming Language book
Documentation 
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# The Rust Programming Language Book Crate

![Build Status](https://github.com/chriskrycho/trpl-crate/workflows/CI/badge.svg)

This repository is the home of the `trpl` crate used in _The Rust Programming
Language_ book materials.

This crate mostly just re-exports items from _other_ crates. It exists for two
main reasons:

1. So that as you read along in _The Rust Programming Language_, you can add
   just one dependency, rather than however many we end up with, and likewise
   use only one set of imports.

2. So that we can more easily guarantee it keeps building and working. Since we
   control the contents of this crate and when it changes, readers will never be
   broken by upstream changes, e.g. if Tokio does a breaking 2.0 release at some
   point.

## Requirements

This crate currently requires at least Rust 1.79.