Remove unused imports

Author: jaimeperez

src/XML/ds/Signature.php

@@ -5,12 +5,10 @@
 namespace SimpleSAML\XMLSecurity\XML\ds;
 
 use DOMElement;
-use Exception;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\XML\Chunk;
 use SimpleSAML\XML\Constants;
 use SimpleSAML\XML\Exception\InvalidDOMElementException;
-use SimpleSAML\XML\Utils as XMLUtils;
 
 /**
  * Class representing a ds:Signature element.