Merge pull request #89 from messagebird/addDataCodingType

added auto in datacodingtype

Author: denizkilic

api/src/main/java/com/messagebird/objects/DataCodingType.java

@@ -7,7 +7,8 @@
  */
 public enum DataCodingType {
     plain("plain"),
-    unicode("unicode");
+    unicode("unicode"),
+    auto("auto");
 
     final String value;