Update sbt-mima-plugin to 1.1.6 (#458)

Author: softwaremill-ci

project/plugins.sbt

@@ -2,4 +2,4 @@ val sbtSoftwareMillVersion = "2.1.1"
 addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-common" % sbtSoftwareMillVersion)
 addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-publish" % sbtSoftwareMillVersion)
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.9.0")
-addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.5")
+addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.6")