Log Message:
Update py-flask-admin to 1.4.2.

1.4.2
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* Small bug fix release. Fixes regression that prevented usage of "virtual"
  columns with a custom formatter.

1.4.1
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* Official Python 3.5 support
* Customizable row actions
* Tablib support (exporting to XLS, XLSX, CSV, etc)
* Updated external dependencies (jQuery, x-editable, etc)
* Added settings that allows exceptions to be raised on view errors
* Bug fixes