This release is the fourth alpha release of the new version 3.0. Please
be aware that the API will still change until v3.0 is released.

changes
^^^^^^^
- minor changes in documentation, tests and examples
- pickle capabilities for faster startup
- first implementation of centering images and QR
- check barcodes based on regex

contributors
^^^^^^^^^^^^
- Patrick Kanzler
- Lucy Linder
- Romain Porte
- Sergio Pulgarin