Pyinstaller-versionfile

Fix

* Add new `translations` parameter to functional API. [DudeNr33]

New

* Add support for *Translation* field to specify supported languages and charsets. [DudeNr33]

* Added a table with the official definition of the parameters in the Readme. [mkhoshbin1]

New

* Functional API for programmatic use. [DudeNr33]

* Drop compatibility with Python<3.6. [DudeNr33]

* Definition of metadata and creation of version file are now handled in separate classes, and it is not strictly necessary to use a file as input. [DudeNr33]

* Use gitchangelog for automatic changelog generation. [dudenr33]