Fix "IntVal" considering boolean values as valid

The commit 54d17ab tried to fix the that "IntVal" would pass with values
that are not considered as an integer, but it does not change

Even thought the commit 54d17ab fixes part of the wrong behaviour it
left out the filter for boolean values.

Co-authored-by: Henrique Moody <henriquemoody@gmail.com>

library/Rules/IntVal.php

@@ -15,7 +15,7 @@ class IntVal extends AbstractRule
 {
     public function validate($input)
     {
-        if (is_float($input)) {
+        if (is_float($input) || is_bool($input)) {
             return false;
         }
 

tests/unit/Rules/IntValTest.php

@@ -64,6 +64,8 @@ class IntValTest extends \PHPUnit_Framework_TestCase
             ['1.0'],
             [1.0],
             [' '],
+            [true],
+            [false],
             ['Foo'],
             ['1.44'],
             [1e-5],