Override toString method

Author: ullenius

src/main/java/dev/personnummer/Personnummer.java

@@ -161,6 +161,11 @@ public Personnummer(String personnummer) throws PersonnummerException {
         this(personnummer, new Options());
     }
 
+	@Override
+	public String toString() {
+		return format();
+	}
+    
     /**
      * Format the personal identity number into a valid string (YYMMDD-/+XXXX)
      * If longFormat is true, it will include the century (YYYYMMDD-/+XXXX)
@@ -234,6 +239,5 @@ public boolean equals(Object obj) {
 		return Objects.equals(format(true), other.format(true));
 	}
 
-    
 
 }