Update sbt-tpolecat to 0.1.15 (#1731)

Author: scala-steward

project/plugins.sbt

@@ -7,7 +7,7 @@ addSbtPlugin("com.github.cb372" % "sbt-explicit-dependencies" % "0.2.15")
 addSbtPlugin("com.github.tkawachi" % "sbt-doctest" % "0.9.7")
 addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.7.6")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.6.0")
-addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.1.14")
+addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.1.15")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.6.1")
 addSbtPlugin("org.wartremover" % "sbt-wartremover" % "2.4.13")