Support napari>=0.5 (#274)* Remove as_dict kwarg* Pin to napari >= 0.5* Fix scatter test?* Update test image* Fix brain data* Fix another as_dict arg* Fix FutureWarning* Fix scatter test's OverflowErrorAnd revert to original baseline images.* Try updating mypy's python version.* Revert shape → newshape and suppress deprecation warning.---------Co-authored-by: Sam Cunliffe <s.cunliffe@ucl.ac.uk>Co-authored-by: Sam Cunliffe <samcunliffe@users.noreply.github.com>

Merge pull request#260 from dstansby/valid-layer-selectionOnly update layers when selection is valid

Merge pull request#273 from dstansby/check-ciPin maximum napari version

Merge pull request#253 from matplotlib/dstansby-patch-1Add 2.0.1 changelog

Merge pull request#246 from dstansby/2.0clogAdd changelog for 2.0

Merge pull request#228 from dstansby/120-clogAdd changelog for version 1.2.0

Merge pull request#148 from jo-mueller/add-feature-histogramadded a Feature Histogram Widget

Merge pull request#190 from dstansby/unpin-napariMake compatible with napari 0.4.18

Merge pull request#189 from dstansby/pin-napariPin max verison of napari

Add write token