Merge pull request #198 from scala-steward/update/sbt-missinglink-0.3.1

Update sbt-missinglink to 0.3.1

Author: mergify[bot]

project/plugins.sbt

@@ -6,4 +6,4 @@ addSbtPlugin("com.47deg" % "sbt-microsites" % "1.1.5")
 addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.4.3")
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.0")
 addSbtPlugin("io.chrisdavenport" % "sbt-mima-version-check" % "0.1.2")
-addSbtPlugin("ch.epfl.scala" % "sbt-missinglink" % "0.3.0")
+addSbtPlugin("ch.epfl.scala" % "sbt-missinglink" % "0.3.1")