v0.0.11

* Add should_upgrade() method

v0.0.10

* Fix header fragmentation parsing
  (58dc648, by Yohan Boniface)

* Optimize feed_data() for memoryviews

v0.0.9

- Errors from callbacks are now propagated correctly
  and predictably

- HTTP Upgrade is now handled more reliably

v0.0.7

- Added support for HTTP Upgrade