Fix issue of case sensitive algorithms (#129)

There is an issue where if loading a provisioning URL with the algorithm in uppercase that an exception is thrown even though the algorithm is valid. This one liner fixes the issue by lowercasing the algorithm name before checking and setting.

src/ParameterTrait.php

@@ -212,6 +212,7 @@ trait ParameterTrait
                 return $value;
             },
             'algorithm' => function ($value) {
+                $value = strtolower($value);
                 Assertion::inArray($value, hash_algos(), sprintf('The "%s" digest is not supported.', $value));
 
                 return $value;