Log Message:
net/yaydl: update to 0.8.0

-Introducing WebDriver support with fantoccini. In theory, yaydl can now use
 Firefox or Chrome for scraping a website, even if its contents require
 JavaScript. The only obvious downside is that this adds complexity to the
 SiteDefinition trait. (Requires a compatible WebDriver client as described in
 the README.)
-Fixed the WatchMDH handler which is the first handler to use a WebDriver.
-Upgraded the argument parser to clap_derive (easier annotation, even easier
 usage).
-Updated the Rust edition to 2021, could be useful later.