Minor improvements.

Author: hrytsenko

lombok.config

@@ -1,3 +1,3 @@
 lombok.addLombokGeneratedAnnotation = true
 lombok.fieldDefaults.defaultPrivate = true
-lombok.fielddefaults.defaultfinal = true
+lombok.fielddefaults.defaultFinal = true

src/main/java/com/github/hrytsenko/jsondata/springboot/error/ServiceException.java

@@ -22,10 +22,6 @@ public class ServiceException extends RuntimeException {
 
     String code;
 
-    private ServiceException(String code) {
-        this(code, null);
-    }
-
     private ServiceException(String code, Throwable cause) {
         super(cause);
         this.code = code;