Added support for creating and resolving merge request discussions (#291).

src/main/java/org/gitlab4j/api/models/Note.java

@@ -105,6 +105,8 @@ public class Note {
     private Participant resolvedBy;
     private Type type;
 
+    private Position position;
+
     public String getAttachment() {
         return attachment;
     }
@@ -257,6 +259,14 @@ public class Note {
       this.type = type;
     }
 
+    public Position getPosition() {
+        return position;
+    }
+
+    public void setPosition(Position position) {
+        this.position = position;
+    }
+
     @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));