Add cross version support with excludeDependencies

plugin/src/main/scala-2.10/coursier/Tasks.scala

@@ -267,14 +267,14 @@ object Tasks {
         rule =>
           if (
             rule.artifact != "*" ||
-              rule.configurations.nonEmpty ||
-              rule.crossVersion != sbt.CrossVersion.Disabled
+              rule.configurations.nonEmpty
           ) {
             log.warn(s"Unsupported exclusion rule $rule")
             anyNonSupportedExclusionRule = true
             Nil
           } else
-            Seq((rule.organization, rule.name))
+            Seq((rule.organization,
+              FromSbt.sbtCrossVersionName(rule.name, rule.crossVersion, sv, sbv)))
       }.toSet
 
       if (anyNonSupportedExclusionRule)

plugin/src/sbt-test/sbt-coursier/exclude-dependencies/build.sbt

@@ -3,3 +3,4 @@ scalaVersion := "2.11.8"
 libraryDependencies += "com.github.alexarchambault" %% "argonaut-shapeless_6.1" % "1.0.0-RC1"
 
 excludeDependencies += SbtExclusionRule("com.chuusai", "shapeless_2.11")
+excludeDependencies += "io.argonaut" %% "argonaut"

plugin/src/sbt-test/sbt-coursier/exclude-dependencies/src/main/scala/Main.scala

@@ -12,10 +12,12 @@ object Main extends App {
   ).toOption.nonEmpty
 
   val shapelessFound = classFound("shapeless.HList")
+  val argonautFound = classFound("argonaut.Json")
   val argonautShapelessFound = classFound("argonaut.derive.MkEncodeJson")
 
   assert(argonautShapelessFound)
   assert(!shapelessFound)
+  assert(!argonautFound)
 
   Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
 }