Add workaround for lightbend-labs/mima#422

Author: aeons

build.sbt

@@ -3,6 +3,9 @@ import BlazePlugin._
 /* Global Build Settings */
 organization in ThisBuild := "org.http4s"
 
+// Workaround for https://github.com/lightbend/mima/issues/422
+resolvers += Resolver.url("typesafe sbt-plugins", url("https://dl.bintray.com/typesafe/sbt-plugins"))(Resolver.ivyStylePatterns)
+
 lazy val commonSettings = Seq(
   description := "NIO Framework for Scala",
   scalaVersion := "2.12.8",