update json4s and spray-json. more Scala 2.12 support

.travis.yml

@@ -1,5 +1,5 @@
 language: scala
-scala:
-  - 2.11.8
 jdk:
   - oraclejdk8
+script:
+  - sbt "so test"

build.sbt

@@ -99,7 +99,6 @@ lazy val supportArgonaut = support("argonaut")
   .settings(crossScalaVersions := Seq("2.10.6", "2.11.8"))
 
 lazy val supportJson4s = support("json4s")
-  .settings(crossScalaVersions := Seq("2.10.6", "2.11.8"))
 
 lazy val supportPlay = support("play")
   .settings(crossScalaVersions := Seq("2.11.8"))
@@ -111,7 +110,6 @@ lazy val supportRojomaV3 = support("rojoma-v3")
   .settings(crossScalaVersions := Seq("2.10.6", "2.11.8"))
 
 lazy val supportSpray = support("spray")
-  .settings(crossScalaVersions := Seq("2.10.6", "2.11.8"))
 
 lazy val benchmark = project.in(file("benchmark"))
   .dependsOn(all.map(Project.classpathDependency[Project]): _*)

support/json4s/build.sbt

@@ -1,5 +1,5 @@
 name := "json4s-support"
 
 libraryDependencies ++= Seq(
-  "org.json4s" %% "json4s-ast" % "3.3.0"
+  "org.json4s" %% "json4s-ast" % "3.4.1"
 )

support/spray/build.sbt

@@ -3,5 +3,5 @@ name := "spray-support"
 resolvers += "spray" at "http://repo.spray.io/"
 
 libraryDependencies ++= Seq(
-  "io.spray" %% "spray-json" % "1.3.1"
+  "io.spray" %% "spray-json" % "1.3.2"
 )