document sbt-scalafix scalafixScalaBinaryVersion

docs/rules/ExplicitResultTypes.md

@@ -34,13 +34,6 @@ This rule has several known limitations, which are most likely fixable with some
 effort. At the time of this writing, there are no short-term plans to address
 these issues however.
 
-### Limited Scala support
-
-Due to implementation details, this rule works only with @SCALA212@. Scala 2.11
-and 2.13 are not supported for this rule. See
-[#988](https://github.com/scalacenter/scalafix/issues/998) if you want to
-contribute support for other Scala versions.
-
 ### Imports ordering
 
 The rewrite inserts imports at the bottom of the global import list. Users are

docs/users/installation.md

@@ -155,6 +155,8 @@ Great! You are all set to use Scalafix with sbt :)
 | `scalafixConfig` | `SettingKey[Option[File]]` | `.scalafix.conf` file to specify which scalafix rules should run, together with their potential options. Defaults to `.scalafix.conf` in the root directory, if it exists.
 | `scalafixDependencies` | `SettingKey[Seq[ModuleID]]` | Dependencies making [custom rules](#run-custom-rules) available via their simple name. Must be set in `ThisBuild`. Defaults to `Nil`.
 | `scalafixResolvers` | `SettingKey[Seq[Repository]]` | Custom resolvers where `scalafixDependencies` are resolved from. Must be set in `ThisBuild`. Defaults to: Ivy2 local, Maven Central, Sonatype releases & Sonatype snapshots.
+| `scalafixScalaBinaryVersion` | `SettingKey[String]` | Scala binary version used for Scalafix execution. Defaults to 2.12. For advanced rules such as ExplicitResultTypes to work, it must match the binary version defined in the build for compiling sources. Note that `scalafixDependencies` artifacts must be published against that Scala version.
+
 
 ### Main and test sources