Updated sbt plugin version on the website

[poslegm]

No description provided.

[tanishiking]

Thanks!
Maybe we can write something like "x.x.x" here instead of a specific version (like "2.0.4") so that we don't need to update here for every release of sbt-scalafmt because we can see the latest version of sbt-scalafmt through the maven badge below.

[poslegm]

I don't like "x.x.x" in documentation because I can't simply copy-paste it into my build.sbt 😄

[tanishiking]

It makes sense 👍 Hmm, I hope we can update this automatically somehow. 🤔

[ches]

Hmm, I hope we can update this automatically somehow.

There is already the badge directly below the addSbtPlugin snippet on the doc site that shows the latest version of the sbt plugin from Maven Central. Perhaps it can be made more obvious, although it doesn't completely solve the copy-paste problem.