bug #117 fix deprecation for di Extension (nexxome)

This PR was merged into the 3.0-dev branch.

Discussion
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| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Fixed tickets |  <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

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  Provide additional information in your description, not the questioner table.
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Commits
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39bb435 fix deprecation for di Extension

src/DependencyInjection/RollerworksPasswordStrengthExtension.php

@@ -14,9 +14,9 @@
 use Rollerworks\Component\PasswordStrength\Validator\Constraints\PasswordStrength;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
 use Symfony\Component\DependencyInjection\Loader;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 final class RollerworksPasswordStrengthExtension extends Extension implements PrependExtensionInterface
 {