simplify resolvers.conf, hopefully improving speed

Author: SethTisue

resolvers.conf

@@ -2,16 +2,8 @@ vars.ivyPat: ", [organisation]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]
 
 options.resolvers: {
   01: "local"
-
   02: "dbuild: https://scala-ci.typesafe.com/artifactory/dbuild/"
   03: "dbuild-ivy: https://scala-ci.typesafe.com/artifactory/dbuild-ivy/"${vars.ivyPat}
-  04: "dbuild-unchecked: https://scala-ci.typesafe.com/artifactory/dbuild-unchecked/" // for sbt plugins not available on ivy (they'll fail the pom check on the `dbuild` cache repo above)
-
-  // this is so we can run the build against an as-yet-unmerged PR if we want
-  05: "scala-pr-validation-snapshots: https://scala-ci.typesafe.com/artifactory/scala-pr-validation-snapshots"
-
-  // and this is where we get Scala nightlies
-  20: "scala-integration: https://scala-ci.typesafe.com/artifactory/scala-integration/"
 }
 
 # to use local Artifactory, you might substitute e.g.: