pneuma 0.2.3

Web framework with middleware

# Changelog
All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).

## [Unreleased]

## [0.2.2] - 2018-08-14
### Added
- request headers

## [0.2.1] - 2018-08-14
### Added
- `stop` for Pneuma instance to stop HttpServer
- methods to controll HttpServer#defaultHeaders

## [0.2.0] - 2018-08-14
### Changed
- Updated to dart version 2

## [0.1.0] - 2018-08-06
### Added
- Middleware as an interface
- Controller to work in MVC kind of manner
- example dir with example

### Changed
- Future based middleware chain

### Removed
- Custom events class
- waterfall recurcive middleware handling
- Log to be a separate middleware

## [0.0.3] - 2015-08-16
### Added
- Initial structure
- Event based controllers concept
- MiddlewareHandler through a waterfall recurcive stack