UpdateProton v0.8.0 alpha released

Here it is: the long awaited steam flatpak support!
Well at least kind of, for not it is experimental.

One known Issue is visable if both the native package and flatpak version of steam is installed.
The flatpak version will take precedence.

But hey, at least some progress 😄

Notable changes

• added Steam flatpak support experimental
• code reformating
• curl shows a progress bar, instead of verbose connection information nothing else actually
• small code improvements

What's Changed

• Update README.md by @heuwerk in #19
• Update README.md by @heuwerk in #20
• First implementation of flatpak support by @heuwerk in #22

Full Changelog: v0.7.0...v0.8.0