chore: account for 1.9.0 changes

- Start using Resolver.sonatypeOssRepos
- Remove the sbt-vspp app since publishing with 1.9.0 fixes the issue it
  solves.

build.sbt

@@ -51,7 +51,7 @@ lazy val root = Project("sbt-scoverage", file("."))
       "utf8"
     ),
     resolvers ++= {
-      if (isSnapshot.value) Seq(Resolver.sonatypeRepo("snapshots")) else Nil
+      if (isSnapshot.value) Resolver.sonatypeOssRepos("snapshots") else Nil
     },
     scriptedLaunchOpts ++= Seq(
       "-Xmx1024M",

project/plugins.sbt

@@ -2,4 +2,3 @@ libraryDependencies += "org.scala-sbt" %% "scripted-plugin" % sbtVersion.value
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.12")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.11.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.0")
-addSbtPlugin("com.scalawilliam.esbeetee" % "sbt-vspp" % "0.4.11")