Plugin doesn't download specified IDE versions for plugin verifier

[mucharafal]

Currently, plugin verifier can download only latest or latest-release versions of IDEs. (in term of args: Seq("[latest]", "[latest-release]").
So that, simply copy-pasting configuration from docs will end up in error, that there is no IDE under given path.
In gradle plugin, IDEs are downloaded by plugin.
Solution here is to update docs or add downloading IDEs and swapping arguments to point to those IDEs.