Branca

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- Make all Element with Template pickable natively (BastienGauthier 144)
- Make _parse_size robust to already parsed values (BastienGauthier 142)
- StepColormap: inclusive lower bound (MxMartin 141)
- Add color schemes: plasma, inferno, magma (FlorinAndrei 131)
- Allow branca ColorMap in write_png (Conengmo 126)
- More flexible _parse_size (Conengmo 125)

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- Properly escape colormap caption (Conengmo 117)
- Multiple fixes in color_brewer (ajabep 115)
- Expose colorbar size variables (Conengmo 77)
- Proper html tags in Figure template (desrod 67)
- Make Element class pickleable (bwest2397 99)
- Improve colorbar representation in notebooks (HaudinFlorence 110)
- Allow custom ticks on colorbar (kota7 113)

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- Support for Pathlib when saving an `Element` (wd60622 103)
- Faster UUID generation for `Element` id (bwest2397 101)
- Store html content in `srcdoc` instead of `data-html` (dstein64 96)
- Add `max_labels` argument to color maps (martinfleis 90)
- Pass caption when converting colormap to steps (ndswaef 87)

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- Fix special char encoding in notebooks, store as percent-encoded (conengmo 76)

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- Prompt Jupyter users to trust notebook (conengmo 75)
- Removed Python 2 specific code (ocefpaf 69)

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- Dropped Python 2 support
- Store html content in a data-html attribute (66)
- Colormap alpha 64
- Fix caption being propagated in scale functions 62
- Assert color type in color_brewer 52