Use scalafix to remove unused import and deprecated procedure syntax (#1074)

* Add sbt-scalafix

* Add scalafix guide to README

* Remove Unused Import

* Remove deprecated procedure syntax

1 files changed, 5 insertions, 1 deletions

diff --git a/build.sbt b/build.sbt
index 90fd4b07..be05bc0b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -28,8 +28,12 @@ def scalacOptionsVersion(scalaVersion: String): Seq[String] = {
   }
 }
 
+addCompilerPlugin(scalafixSemanticdb) // enable SemanticDB
+
 scalacOptions := scalacOptionsVersion(scalaVersion.value) ++ Seq(
-  "-deprecation"
+  "-deprecation",
+  "-Yrangepos",          // required by SemanticDB compiler plugin
+  "-Ywarn-unused-import" // required by `RemoveUnused` rule
 )
 
 def javacOptionsVersion(scalaVersion: String): Seq[String] = {