rustls 0.9.0

Rustls is a modern TLS library written in Rust.
Documentation 
#!/bin/sh
# Extract the introductory documentation into the README.md

set -e

awk 'BEGIN { take=1 }/# Approach/{take=0;print}take' < README.md > README.md.new
grep '^//!' src/lib.rs | sed -e 's@^\/\/\! *@@g' | awk '/# Rustls - a modern TLS library/{take=1;next}/## Design Overview/{take=0}take' >> README.md.new
awk '/# Example code/{take=1}take' < README.md >> README.md.new
mv README.md.new README.md