bug #18310 [Guard] fix minimum required Seucirty Http version (xabbuh)

This PR was merged into the 3.1-dev branch.

Discussion
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[Guard] fix minimum required Seucirty Http version

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #17714
| License       | MIT
| Doc PR        |

Otherwise, the `TargetPathTrait` is not available.

Commits
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952bf01 [Guard] fix minimum required Seucirty Http version

src/Symfony/Component/Security/Guard/composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=5.5.9",
         "symfony/security-core": "~2.8|~3.0",
-        "symfony/security-http": "~2.8|~3.0"
+        "symfony/security-http": "~3.1"
     },
     "require-dev": {
         "psr/log": "~1.0"