fix warnings

karate-gatling/src/test/scala/mock/CatsSimulationWithSilentWarmUp.scala

@@ -1,37 +1,39 @@
 package mock
 
 import com.intuit.karate.Runner
+import com.intuit.karate.gatling.KarateProtocol
 import com.intuit.karate.gatling.PreDef._
 import io.gatling.core.Predef._
+import io.gatling.core.structure.ScenarioBuilder
 
 import scala.concurrent.duration._
 
 class CatsSimulationWithSilentWarmUp extends Simulation {
 
   MockUtils.startServer(0)
 
-  val protocol = karateProtocol(
+  val protocol: KarateProtocol = karateProtocol(
     "/cats/{id}" -> Nil,
     "/cats" -> pauseFor("get" -> 15, "post" -> 25)
   )
 
   protocol.nameResolver = (req, ctx) => req.getHeader("karate-name")
   protocol.runner.karateEnv("perf")
 
-  val createWarmup = scenario("create warm-up").exec(karateFeature("classpath:mock/cats-create.feature").silent)
-  val create = scenario("create").exec(karateFeature("classpath:mock/cats-create.feature")).exec(session => {
+  val createWarmup: ScenarioBuilder = scenario("create warm-up").exec(karateFeature("classpath:mock/cats-create.feature").silent())
+  val create: ScenarioBuilder = scenario("create").exec(karateFeature("classpath:mock/cats-create.feature")).exec(session => {
     println("*** id in gatling: " + session("id").as[String])
     println("*** session status in gatling: " + session.status)
     session
   })
 
-  val deleteWarmup = scenario("delete warm-up").exec(karateFeature("classpath:mock/cats-delete.feature").silent)
-  val delete = scenario("delete").group("delete cats") {
+  val deleteWarmup: ScenarioBuilder = scenario("delete warm-up").exec(karateFeature("classpath:mock/cats-delete.feature").silent())
+  val delete: ScenarioBuilder = scenario("delete").group("delete cats") {
     exec(karateFeature("classpath:mock/cats-delete.feature@name=delete"))
   }
 
-  val customWarmup = scenario("custom warm-up").exec(karateFeature("classpath:mock/cats-rpc.feature").silent)
-  val custom = scenario("custom").exec(karateFeature("classpath:mock/custom-rpc.feature"))
+  val customWarmup: ScenarioBuilder = scenario("custom warm-up").exec(karateFeature("classpath:mock/cats-rpc.feature").silent())
+  val custom: ScenarioBuilder = scenario("custom").exec(karateFeature("classpath:mock/custom-rpc.feature"))
 
   setUp(
     createWarmup.inject(rampUsers(1) during (5 seconds)).andThen(