Merge pull request vertical-blank#20 from scala-steward/update/sbt-release-1.0.13

Update sbt-release to 1.0.13

Author: vertical-blank

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.scala-js"       % "sbt-scalajs"              % "0.6.31")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.6.1")
 addSbtPlugin("org.xerial.sbt"     % "sbt-sonatype"             % "3.8.1")
-addSbtPlugin("com.github.gseitz"  % "sbt-release"              % "1.0.12")
+addSbtPlugin("com.github.gseitz"  % "sbt-release"              % "1.0.13")
 addSbtPlugin("com.jsuereth"       % "sbt-pgp"                  % "2.0.1")