install sbt-scoverage plugin (cequence-io#24)

Author: phelps-sg

project/plugins.sbt

@@ -1,4 +1,10 @@
 logLevel := Level.Warn
 
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.15")
-addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.1.2")
+addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.1.2")
+
+// Test Coverage plugin.
+// ~
+// sbt-scoverage is a plugin for SBT that integrates the scoverage code coverage library.
+// See more: https://github.com/scoverage/sbt-scoverage
+addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.8")