Update sbt-mima-plugin to 1.1.4 (#296)

Author: scala-steward

project/plugins.sbt

@@ -7,6 +7,6 @@ addSbtPlugin("com.github.sbt" % "sbt-release" % "1.4.0")
 addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.2.1")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.12")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.7")
-addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.3")
+addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.4")
 addSbtPlugin("org.scoverage" % "sbt-coveralls" % "1.3.13")
 addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.6.4")