fix serialization of Comment

fix #8

wrapper/src/main/java/wekan/wrapper/entity/Comment.java

@@ -7,7 +7,9 @@ import java.util.Date;
 public class Comment {
     @SerializedName("_id")
     private String id;
+    @SerializedName(value = "comment", alternate = "text")
     private String comment;
+    @SerializedName(value = "authorId", alternate = "userId")
     private String authorId;
     private String boardId;
     private String cardId;
@@ -26,6 +28,22 @@ public class Comment {
         return authorId;
     }
 
+    public String getBoardId() {
+        return boardId;
+    }
+
+    public String getCardId() {
+        return cardId;
+    }
+
+    public Date getCreatedAt() {
+        return createdAt;
+    }
+
+    public Date getModifiedAt() {
+        return modifiedAt;
+    }
+
     @Override
     public String toString() {
         return "Comment{" +

wrapper/src/test/java/wekan/wrapper/api/CardCommentServiceTest.java

@@ -103,6 +103,8 @@ public class CardCommentServiceTest {
             ).execute().body();
 
             assertNotNull(comment);
+            assertNotNull(comment.getAuthorId());
+            assertNotNull(comment.getComment());
         } catch (IOException e) {
             e.printStackTrace();
         }