Merge pull request #505 from scala-steward/update/json4s-ext-3.6.11

Update json4s-ext, json4s-jackson to 3.6.11

Author: zarthross

Diff for: project/Dependencies.scala

@@ -15,7 +15,7 @@ object Dependencies {
   lazy val http4sJetty         = "org.http4s"                 %% "http4s-servlet"        % http4sVersion
   lazy val http4sJson4sJackson = "org.http4s"                 %% "http4s-json4s-jackson" % http4sVersion
   lazy val http4sXmlInstances  = "org.http4s"                 %% "http4s-scala-xml"      % http4sVersion
-  lazy val json4s              = "org.json4s"                 %% "json4s-ext"            % "3.6.10"
+  lazy val json4s              = "org.json4s"                 %% "json4s-ext"            % "3.6.11"
   lazy val json4sJackson       = "org.json4s"                 %% "json4s-jackson"        % json4s.revision
   lazy val swaggerModels       = "io.swagger"                  % "swagger-models"        % "1.6.2"
   lazy val swaggerCore         = "io.swagger"                  % "swagger-core"          % swaggerModels.revision