minor #13679 [Form] OptionsResolver 3.0 is not BC anymore (nicolas-grekas)

This PR was merged into the 2.7 branch.

Discussion
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[Form] OptionsResolver 3.0 is not BC anymore

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

Commits
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a0af484 [Form] OptionsResolver 3.0 is not BC anymore

Author: fabpot

src/Symfony/Component/Form/composer.json

@@ -19,7 +19,7 @@
         "php": ">=5.3.9",
         "symfony/event-dispatcher": "~2.1|~3.0.0",
         "symfony/intl": "~2.3|~3.0.0",
-        "symfony/options-resolver": "~2.6|~3.0.0",
+        "symfony/options-resolver": "~2.6",
         "symfony/property-access": "~2.3|~3.0.0"
     },
     "require-dev": {