Add 0.12 release notes (#231)

doc/misc/release-notes/release-v0.12.md

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+# skan v0.12.0
+
+This release adds NumPy 2.0 compatibility (while remaining compatible with 1.x)
+([#229](https://github.com/jni/skan/pull/229)). It also lays the groundwork for
+new skeleton editing features with bidirectional Skeleton to NetworkX
+conversion functions ([#224](https://github.com/jni/skan/pull/224).
+
+We also have a minor deprecation that should improve quality of life in the
+future: column names in the summary dataframe can now use `_` as the separator
+(instead of `-`), which allows one to use the pandas attribute access for
+columns (for example, `summary.branch_distance` instead of
+`summary['branch-distance']`. Use the `separator='_'` keyword argument to
+`summarize` to take advantage of this feature (which will become the default in
+a future version), or `separator='-'` to maintain the current behavior even
+when new versions come out ([#215](https://github.com/jni/skan/pull/215)).
+
+The napari plugin now lets you make a Shapes layer fully backed by a Skeleton
+dataset, including coloring the edges by features in the summary table
+([#201](https://github.com/jni/skan/pull/201)).
+
+Thanks to [Neil Shephard](https://github.com/ns-rse),
+[James Ryan](https://github.com/jamesyan-git),
+[Jarod Hanko](https://github.com/jarodhanko-crafco), and
+[Tim Monko](https://github.com/TimMonko) for their contributions to this
+release! 🙏 You can find the full list of changes below:
+
+## API changes
+
+- [#215](https://github.com/jni/skan/pull/215): The separators used for column
+  names are configurable, and will transition to `_` in the future. This is to
+  make it easier to use the dataframe attribute interface, e.g.
+  `summary.branch_distance`
+
+## New features
+
+- [#229](https://github.com/jni/skan/pull/229): NumPy 2 compatibility
+- [#224](https://github.com/jni/skan/pull/224): Create a networkx summary graph
+  from a Skeleton
+- [#201](https://github.com/jni/skan/pull/201): Add napari widget to generate
+  shapes layer from a skeletonized label layer
+
+## Improvements
+
+- [#220](https://github.com/jni/skan/pull/220): Allow mean pixel value
+  calculation from integer values, not just floats
+- [#212](https://github.com/jni/skan/pull/212): Improved error reporting and
+  tests for prune_paths methods
+
+## Bug fixes
+
+- [#221](https://github.com/jni/skan/pull/221): Fix documentation builds
+- [#210](https://github.com/jni/skan/pull/210): Cache skeleton_image shape for
+  use by the path_label_image method
+
+## Documentation
+
+- [#231](https://github.com/jni/skan/pull/231): Add 0.12 release notes
+
+## Misc
+
+- [#218](https://github.com/jni/skan/pull/218): Fix pyproject.toml metadata
+  formatting
+- [#217](https://github.com/jni/skan/pull/217): Migrate from setup.cfg to
+  pyproject.toml
+