Upgrade branch 2.6.x using TemplateControl (playframework#51)

* Updated with template-control on 2018-07-19T01:58:56.003Z
  **build.sbt:
    scalaVersion := "2.12.6"
  **/plugins.sbt:
    addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.6.17")
  **build.gradle:
    def playVersion = "2.6.17"

* Revert scala change

build.gradle

@@ -4,7 +4,7 @@ plugins {
     id "com.github.lkishalmi.gatling" version "0.7.1"
 }
 
-def playVersion = "2.6.16"
+def playVersion = "2.6.17"
 def scalaVersion = System.getProperty("scala.binary.version", /* default = */ "2.12")
 def gatlingVersion = getGlatlingVersion(scalaVersion)
 

build.sbt

@@ -9,7 +9,7 @@ def gatlingVersion(scalaBinVer: String): String = scalaBinVer match {
 
 inThisBuild(
   List(
-    scalaVersion := "2.12.6",
+  scalaVersion := "2.12.6",
     crossScalaVersions := Seq("2.11.12", "2.12.6"),
     dependencyOverrides := Seq(
        "org.codehaus.plexus" % "plexus-utils" % "3.0.18",

project/plugins.sbt

@@ -1,5 +1,5 @@
 // The Play plugin
-addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.6.16")
+addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.6.17")
 
 // Load testing tool:
 // http://gatling.io/docs/2.2.2/extensions/sbt_plugin.html