Update README.md

README.md

   - Use java.util's `new Date().getTime()` for the timestamp
   - Provide the detail and developer messages from the `ResourceNotFoundException`
 
-```
+```java
 @ExceptionHandler(ResourceNotFoundException.class)
 public ResponseEntity<?> handleResourceNotFoundException(ResourceNotFoundException rnfe, HttpServletRequest request) {...}
 ```
 
 - add below handler to `RestExceptionHandler`
 
-```
+```java
 @ExceptionHandler(MethodArgumentNotValidException.class)
 public ResponseEntity<?>
 handleValidationError(  MethodArgumentNotValidException manve,
 - For each field error, add it to the appropriate list in the ErrorDetail (see below)
 - Return a `ResponseEntity` containing the error detail and the appropriate HTTP status code (`400 Bad Request`)
 
-```
+```java
 List<FieldError> fieldErrors =  manve.getBindingResult().getFieldErrors();
 		for(FieldError fe : fieldErrors) {