Update sbt-pgp to 2.0.0 (#21)

Author: scala-steward

project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.11")
 
-addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.1.2")
+addSbtPlugin("com.jsuereth" % "sbt-pgp" % "2.0.0")
 
 addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.9.2")