Make serialVersionUID private on Exception types (#358)

Author: rbygrave

json-core/src/main/java/io/avaje/json/JsonDataException.java

@@ -20,7 +20,7 @@
  */
 public class JsonDataException extends JsonException {
 
-  static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
 
   public JsonDataException(String message) {
     super(message);

json-core/src/main/java/io/avaje/json/JsonEofException.java

@@ -7,7 +7,7 @@
  */
 public class JsonEofException extends JsonIoException {
 
-  static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
 
   public JsonEofException(IOException cause) {
     super(cause);

json-core/src/main/java/io/avaje/json/JsonException.java

@@ -21,7 +21,7 @@
  */
 public class JsonException extends RuntimeException {
 
-  static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
 
   public JsonException(String message) {
     super(message);

json-core/src/main/java/io/avaje/json/JsonIoException.java

@@ -22,7 +22,7 @@
  */
 public class JsonIoException extends JsonException {
 
-  static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
 
   public JsonIoException(IOException cause) {
     super(cause);