CHANGELOG.md: make master branch point to release branch

CHANGELOG.md

@@ -1,75 +1,8 @@
-# 0.4.1 (2020-Sep-18)
+# See elsewhere for changelog
 
-- Fix the test suite on Windows (hopefully).
+This project’s release notes are curated from the Git history of its main
+branch. You can find them by looking at [the version of this file on the
+`release` branch][branch] or the [GitHub release history][gh-releases].
 
-# 0.4.0 (2020-Sep-15)
-
-- Add a bunch of CLI documentation.
-- No code changes.
-
-# 0.3.0 (2020-Jul-30)
-
-- Add `wwtdatatool serve` to locally serve WTML files with on-the-fly URL
-  rewriting.
-- Add `wwtdatatool wtml rewrite-urls` to allow you to take a WTML file with
-  relative URLs and convert them into absolute ones.
-- `wwtdatatool cabinet unpack`: copy with cabinet files whose paths begin with a
-  leading slash (as in the default WWT installer `datafiles.cabinet` file).
-- In `wwt_data_formats.layers`, support WWTL files where the data assets are not
-  necessarily placed in a subdirectory named for the layer ID (observed in the
-  wild).
-- In `wwt_data_formates.imageset`, copy with WCS PC matrices that have non-unity
-  determinants (also observed in the wild).
-
-
-# 0.2.0 (2020-Jun-17)
-
-- Clarify that the `requests` package is now always required.
-- Add `wwt_data_formats.layers` for dealing with WWTL layer-export files.
-
-
-# 0.1.3 (2020-Jun-06)
-
-- Add a CLI tool, `wwtdatatool`, to provide interfaces to certain low-level
-  operations
-- Add some infrastructure to support walking of trees of folders with on-the-fly
-  downloads as needed.
-- Support the Imageset::reference_frame attribute
-- Support Communities metadata
-- Fix the test suite for Python 3.8
-
-
-# 0.1.2 (2020-Mar-20)
-
-- Fix roundtripping of imagesets with a non-empty QuadTreeMap, and add a few
-  more attributes on the `<ImageSet>` type.
-- Fix loading of XML files missing attributes that we expected to see.
-- Allow "Tangent" as an alias for "Tan" when deserializing ProjectionType
-  enums.
-- Add `to_xml_string()` and `write_xml()` convenience methods on the
-  LockedXmlTraits class that's a base class for most of our data types.
-
-
-# 0.1.1 (2020-Mar-17)
-
-- Fix `wwt_data_formats.imageset.ImageSet.set_position_from_wcs()` for the new
-  metadata scheme.
-
-
-# 0.1.0 (2020-Mar-17)
-
-- Massive infrastructure rebuild. We now use traitlets and have a framework
-  for XML serialization, rather than a bunch of boilerplate code. We can
-  now deserialize folders and their contents.
-
-
-# 0.0.2 (2020-Feb-05)
-
-- Document the FileCabinet support
-- Work with FITS files that have `CDELT{1,2}` but not `PC1_1` and `PC2_2`.
-- Removed Python 2.7 from the CI.
-
-
-# 0.0.1 (2019-Dec-04)
-
-- First version
+[branch]: https://github.com/WorldWideTelescope/wwt_data_formats/blob/release/CHANGELOG.md
+[gh-releases]: https://github.com/WorldWideTelescope/wwt_data_formats/releases