Add Whoops exception handler (nicer debug info in dev mode)

On production = no errors

CHANGELOG.md

@@ -30,6 +30,7 @@ Minimum PHP version for this release is 7.2.5.
 * support for Account Number
   * suggest account number option
 * many new functions, hooks and configurables
+* better Exception Handler (Whoops - https://github.com/filp/whoops)
 
 ### Changed
 * Composer is now used for external libraries like: Twig, PHPMailer, fast-route etc.