Grammar fix (#39)

* ci: scrutinizer simplification

* tweak: grammar fix

Author: Greg Bowler

src/Rule/MaxLength.php

@@ -15,6 +15,6 @@ public function isValid(Element $element, string $value, array $inputKvp):bool {
 
 	public function getHint(Element $element, string $value):string {
 		$maxLength = $element->getAttribute("maxlength");
-		return "This field's value must contain $maxLength characters or less";
+		return "This field's value must not contain more than $maxLength characters";
 	}
 }

test/phpunit/Rule/MaxLengthTest.php

@@ -39,7 +39,7 @@ public function testMaxLength() {
 		catch(ValidationException $exception) {
 			$errorList = iterator_to_array($validator->getLastErrorList());
 			self::assertContains(
-				"This field's value must contain 120 characters or less",
+				"This field's value must not contain more than 120 characters",
 				$errorList["tweet"]
 			);
 		}