Merge pull request #115 from target/update/circe-core-0.11.2

Update circe-core, circe-generic, ... to 0.11.2

Author: colindean

build.sbt

@@ -5,7 +5,7 @@ scalaVersion := "2.11.12"
 
 val sparkVersion = "2.3.4"
 
-val circeVersion = "0.10.1"
+val circeVersion = "0.11.2"
 
 //addDependencyTreePlugin
 enablePlugins(GitVersioning)