Restore sourcegraph plugin 0.3

Author: kciesielski

project/plugins.sbt

@@ -9,4 +9,4 @@ addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.16.0")
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.1")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.3")
 
-addSbtPlugin("com.sourcegraph" % "sbt-sourcegraph" % "0.4.3")
+addSbtPlugin("com.sourcegraph" % "sbt-sourcegraph" % "0.3.3")