Fix the `update=True` feature

[tristanlatr]

The technologies are now dispatched into several files: https://github.com/AliasIO/wappalyzer/tree/master/src/technologies

This line is failing with a 404: https://github.com/chorsley/python-Wappalyzer/blob/master/Wappalyzer/Wappalyzer.py#L246

We can simply get all files and merge them into a single data structure.