Merge pull request #83 from eikek/update/sbt-mdoc-2.8.0

Update sbt-mdoc to 2.8.0

Author: mergify[bot]

project/plugins.sbt

@@ -4,5 +4,5 @@ addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.11.2")
 addSbtPlugin("com.github.sbt" % "sbt-dynver" % "5.1.1")
 addSbtPlugin("com.github.sbt" % "sbt-git" % "2.1.0")
 addSbtPlugin("io.spray" % "sbt-revolver" % "0.10.0")
-addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.7.2")
+addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.8.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.5")