Update README

Update the README so the crates.io site has a proper example.

allow response transformation

• Replace Director function with RequestTransformer / ResponseTransformer pair

Do not require a threadpool

• Don't fail if thread pool cannot be created
• Update flask-rs version

simple_proxy

• create the simple_proxy function
• remove the main.rs file

Non-backwards compatible flask upgrade

Switch to using flask 2.x.y

Allow any 0.2.x version of http crate

0.2.1

bump verson: 0.2.0 ~> 0.2.1

Fix crash when proxying to unavailable server

0.2.0

bump Cargo package version

Initial Release to crates.io

0.1.0

update Cargo.toml file

use bottle parser library

0.0.2

use streambuf::read_line in bottle

Initial Release

Expose functions

• simple_proxy
• generic_proxy