Release version 0.3.0

Added support for the following file types: `BBR_NOM_1B`, `BM__RAD_2B`,
`BMA_FLX_2B`.

New features
------------

- It is now possible to select the different resolutions in BBR L1 and L2
products with the following syntax: `ec.full`, `ec.standard`, `ec.small`, and
with `ec.assessment` for `BM__RAD_2B` and `BMA_FLX_2B`.
- For the `BBR_NOM_1B` and `BM__RAD_2B` products, it is possible to obtain
Shapely polygons representing the PSF one-weight and zero_weight boundaries
with `ec.one_weight_edge_polygons` and `ec.zero_weight_edge_polygons`.
- There are new categorical Pandas data types for the BBR views and bands.

Changes breaking backward compatibility of the interface
--------------------------------------------------------

None.

Other changes
-------------

- There are two new dependencies: `pandas` and `shapely`.