Update tethys-core, tethys-derivation, ... to 0.29.6

Author: scala-steward

project/Versions.scala

@@ -46,7 +46,7 @@ object Versions {
   val playServer = "3.0.9"
   val play29Client = "2.2.12"
   val play29Server = "2.9.9"
-  val tethys = "0.29.5"
+  val tethys = "0.29.6"
   val vertx = "4.5.21"
   val jsScalaJavaTime = "2.6.0"
   val nativeScalaJavaTime = "2.6.0"