- Update to 5.1.1:
  * infer dtype pandas fallback
  * The chart.transformed_data() method was added to extract transformed
    chart data
  * Introduction of a new data transformer named vegafusion
  * A JupyterChart class was added to support accessing params and
    selections from Python
  * Support for field encoding inference for objects that support the
    DataFrame Interchange Protocol
  * Add support for new referencing logic in version 4.18 of jsonschema
  * A new transform method transform_extent is available
  * Drop support for Python 3.7 which is end-of-life
  * Hard dependencies: Increase minimum required pandas version to 0.25
  * TitleParam to Title in example gallery and sync scatterplot table
  * Fix bug in reconstructing layered charts with from_json/from_dict
  * Remove extra files in site-packages from wheel
  * Introduction of parameters. There are two types of parameters, selection
    parameters and variable parameters. Variable parameters are new to
    Altair, and while selections are not new, much of the old terminology
    has been deprecated.
  * Grouped bar charts and jitter are now supported using offset channels
  * vl-convert is now used as the default backend for saving Altair charts as
    svg and png files
  * Saving charts with HTML inline is now supported without having
    altair_saver installed.
  * Ordered pandas categorical data are now automatically encoded as sorted
    ordinal data.
  * The Title and Impute aliases were added for TitleParams and ImputeParams
  * More informative autocompletion by removing deprecated methods and for
  * Substantially improved error handling. Both in terms of finding the more

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