minor symfony#24760 Fix tests (fabpot)

This PR was merged into the 3.4 branch.

Discussion
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Fix tests

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | fingers crossed
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

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Commits
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2280f84 fixed tests

Author: fabpot

src/Symfony/Bridge/Twig/composer.json

@@ -24,7 +24,7 @@
         "symfony/asset": "~2.8|~3.0|~4.0",
         "symfony/dependency-injection": "~2.8|~3.0|~4.0",
         "symfony/finder": "~2.8|~3.0|~4.0",
-        "symfony/form": "~3.4-beta2|~4.0",
+        "symfony/form": "~3.4-beta2|~4.0-beta2",
         "symfony/http-foundation": "^3.3.11|~4.0",
         "symfony/http-kernel": "~3.2|~4.0",
         "symfony/polyfill-intl-icu": "~1.0",