Merge pull request #139 from scala-steward/update/sbt-ci-release-1.5.3

Update sbt-ci-release to 1.5.3

Author: fthomas

project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("com.dwijnand" % "sbt-travisci" % "1.2.0")
 
-addSbtPlugin("com.geirsson" % "sbt-ci-release" % "1.5.2")
+addSbtPlugin("com.geirsson" % "sbt-ci-release" % "1.5.3")
 
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")