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New Features
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* New method to construct spectra from NDBC buoy data (`PR17 <https://github.com/wavespectra/wavespectra/pull/17>`_).
* New method to output spectra in native WW3 format.
Bug Fixes
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* Fix bug with selecting circular longitudes in different conventions (`GH20 <https://github.com/wavespectra/wavespectra/issues/20>`_).
* Ensure directions in coming-from convention in read_era5 (`PR18 <https://github.com/wavespectra/wavespectra/pull/18>`_).
* Fix radian convertions in read_era5 (`PR19 <https://github.com/wavespectra/wavespectra/pull/19>`_).
* Fix coordinate values assignment errors with xarray>=0.15.1 (`GH16 <https://github.com/wavespectra/wavespectra/issues/16>`_).
* Ensure coordinates attributes are kept with certain readers.
deprecation
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* Deprecated legacy `read_ww3_msl` reader.
* Deprecated `read_dictionary` in favour of using xarray's `to_dict`_ and `from_dict`_ methods.
.. _`to_dict`: http://xarray.pydata.org/en/stable/generated/xarray.DataArray.to_dict.html
.. _`from_dict`: http://xarray.pydata.org/en/stable/generated/xarray.DataArray.from_dict.html
Internal Changes
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* Remove curly brackets from units.
* Remove original variable attributes from files hidden with underscores (`_units` and `_variable_name`).
* Remove xarray version limitation to <0.15.0.