- Actually declare the minimum version requirement for
  asdf-wcs-schemas.
- update to 0.21.0:
  * Add a minimum version requirement for asdf-wcs-schemas.
  * Fix WCS.__str__ for instances without transforms.

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- update to 0.20.0:
  * Replace ``pkg_resources`` with ``importlib.metadata``. [#478]
  * Serialize and deserialize ``pixel_shape`` with asdf. [#480]
  * Synchronize ``array_shape`` and ``pixel_shape`` attributes of
    WCS objects. [#439]
  * Fix failures and warnings with numpy 2.0. [#472]
  * Remove deprecated old ``bounding_box``. The new
    implementation is released with
  * Refactor ``CoordinateFrame.axis_physical_types``. [#459]
  * ``StokesFrame`` uses now ``astropy.coordinates.StokesCoord``.
  * Dropped support for Python 3.8. [#451]
  * Fixed a call to ``astropy.coordinates`` in
    ``wcstools.wcs_from_points``. [#448]
  * Code and docstrings clean up. [#460]
  * Register all available asdf extension manifests from ``asdf-
    wcs-schemas``

  * Added an option to to_fits_sip() to be able to specify the
  * Added support for providing custom range of degrees in
  * Fix a formula for estimating crpix in to_fits_sip() so that
  * Allow sub-pixel sampling of the WCS model when computing SIP
  * Fixed a bug in to_fits_sip due to which inv_degree was
  * Added insert_frame method to modify the pipeline of a
  * Added to_fits_tab method to generate FITS header and binary
  * Added in_image function for testing whether a point in world
    coordinates maps back to the domain of definition of the
  * Updated versions of schemas for gwcs objects based on
    latest versions of transform schemas in asdf-standard.
  * Added a wcs.Step class to allow serialization to ASDF to
  * WCS.pipeline now is a list of Step instances instead of

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- Update to 0.18.3
  * Fix pixel scale formula used by iterative inverse by @mcara in
    #423
  * refactor for Tox 4 by @zacharyburnett in #428
  * Improve stability of SIP fitting. Fix constant term - CRPIX -
    in SIP by @mcara in #427
  * use canonical name of RTD config and enable nitpicky mode to
    catch broken links in docs by @zacharyburnett in #430
  * add downstream tests for JWST and Roman calibration pipelines
    by @zacharyburnett in #415
  * fix CRDS_PATH in CI when running downstream tests by
    @zacharyburnett in #432 (forwarded request 1058262 from bnavigator)

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- Update to 0.18.2
  * Corrected the reported requested forward SIP accuracy and
    reported fit residuals by to_fits_sip() and to_fits(). [#413,
    #419]
  * Fixed a bug due to which the check for divergence in
    _fit_2D_poly() and hence in to_fits() and to_fits_sip() was
    ignored. [#414]

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- Update to 0.18.1
  * Bug fix update
  * Remove references to the ``six`` package. [#402]
  * Fix asdf-astropy related test failure (forwarded request 962341 from bnavigator)

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- update to 0.13.0
  - Added two new transforms - ``SphericalToCartesian`` and
  ``CartesianToSpherical``. [#275, #284, #285]
  - Added ``to_fits_sip`` method to generate FITS header with SIP keywords [#286]
  - Added ``get_ctype_from_ucd`` function. [#288]
  - Fixed an off by one issue in ``utils.make_fitswcs_transform``. [#290]

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