Update NotBlank constraint description

sidux · javiereguiluz · commit d059bee62a97 · 2018-05-23T09:27:01.000+02:00
diff --git a/reference/constraints/NotBlank.rst b/reference/constraints/NotBlank.rst
@@ -2,7 +2,7 @@ NotBlank
 ========
 
 Validates that a value is not blank - meaning not equal to a blank string,
-a blank array or ``null``::
+a blank array, ``null`` or ``false``::
 
     if (false === $value || (empty($value) && '0' != $value)) {
         // validation will fail
