Update README.md

I'm currently less focused on v2. Maybe it won't end up getting released and I'll just copy the best features to the master branch. Multilingual models don't work as well as I thought they would and I think Argos Translate's current architecture of one neural net per language pair actually works pretty well.

README.md

@@ -187,9 +187,6 @@ You can help support Argos Translate financially by purchasing hosting through t
 - [Sharktech](https://portal.sharktech.net/aff.php?aff=1181) - Cheap bandwith
 - [Time4VPS](https://www.time4vps.com/?affid=6929) - Cheap storage
 
-#### Argos Translate 2 beta
-A beta version of Argos Translate 2 is available to install from source from the [v2 branch on GitHub](https://github.com/argosopentech/argos-translate/tree/v2). Argos Translate 2 has a [multilingual model architecture](https://community.libretranslate.com/t/multilingual-translation-with-ctranslate2-and-pre-trained-fairseq-models/178/), more extensive unit testing, and a more experimental orientation.
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 ## Contributing
 Contributions are welcome! Bug reports, pull requests, documentation writing, and feature ideas are all appreciated.