minor symfony#24058 [FrameworkBundle] Fix Form conflict rule (chalasr)

This PR was merged into the 3.4 branch.

Discussion
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[FrameworkBundle] Fix Form conflict rule

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

Fixes https://travis-ci.org/symfony/symfony/jobs/270430600#L2628.
/cc @ogizanagi @yceruto

Commits
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e1f9ff6 [FrameworkBundle] Fix form conflict rule

Author: nicolas-grekas

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -65,7 +65,7 @@
         "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
         "symfony/asset": "<3.3",
         "symfony/console": "<3.4",
-        "symfony/form": "<3.3",
+        "symfony/form": "<3.4",
         "symfony/property-info": "<3.3",
         "symfony/serializer": "<3.3",
         "symfony/translation": "<3.4",