Excalibur-py

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* Fix pypdf import.

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* Fix deprecated camelot methods.

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* Add GitHub Action for automated Linux, MacOS and Windows builds. [107](https://github.com/camelot-dev/excalibur/pull/107) by [arky](https://github.com/arky).

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**Improvements**

* The command-line interface can now be run using `python -m excalibur`. [97](https://github.com/camelot-dev/excalibur/pull/97).
* Excalibur now follows the Black code style! [98](https://github.com/camelot-dev/excalibur/pull/98).

**Bugfixes**

* [95](https://github.com/camelot-dev/excalibur/issues/95) Fix Werkzeug import error. [#96](https://github.com/camelot-dev/excalibur/pull/96).

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**Bugfixes**

* [41](https://github.com/camelot-dev/excalibur/issues/41) Fix failed function call wrt to upstream changes. [#42](https://github.com/camelot-dev/excalibur/pull/42) by Vinayak Mehta.

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**Bugfixes**

* [32](https://github.com/camelot-dev/excalibur/issues/32) Changing port in excalibur.cfg has no effect. [#34](https://github.com/camelot-dev/excalibur/pull/34) by Vinayak Mehta.