No unnecessary warning message with the launch command

when using the proguarded coursier launcher

cli/src/main/scala-2.11/coursier/cli/Coursier.scala

@@ -13,6 +13,7 @@ import coursier.util.Parse
 
 import scala.annotation.tailrec
 import scala.language.reflectiveCalls
+import scala.util.Try
 
 case class CommonOptions(
   @Help("Keep optional dependencies (Maven)")
@@ -228,7 +229,9 @@ case class Launch(
 
   val contextLoader = Thread.currentThread().getContextClassLoader
 
-  val parentLoader0: ClassLoader = Launch.mainClassLoader(contextLoader)
+  val parentLoader0: ClassLoader =
+    if (Try(contextLoader.loadClass("coursier.Launch")).isSuccess)
+      Launch.mainClassLoader(contextLoader)
         .flatMap(cl => Option(cl.getParent))
         .getOrElse {
           if (common.verbose0 >= 0)
@@ -240,6 +243,9 @@ case class Launch(
             )
           contextLoader
         }
+    else
+      // proguarded -> no risk of conflicts, no need to find a specific ClassLoader
+      contextLoader
 
   val (parentLoader, filteredFiles) =
     if (isolated.isolated.isEmpty)