minor #14164 [3.0] [Form] added missing CHANGELOG notes. (hhamon)

This PR was merged into the 3.0-dev branch.

Discussion
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[3.0] [Form] added missing CHANGELOG notes.

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

Commits
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37f7033 [Form] added missing CHANGELOG notes.

src/Symfony/Component/Form/CHANGELOG.md

@@ -1,11 +1,21 @@
 CHANGELOG
 =========
 
+3.0.0
+-----
+
+ * removed `FormTypeInterface::setDefaultOptions()` method
+ * removed `AbstractType::setDefaultOptions()` method
+ * removed `FormTypeExtensionInterface::setDefaultOptions()` method
+ * removed `AbstractTypeExtension::setDefaultOptions()` method
+ * added `FormTypeInterface::configureOptions()` method
+ * added `FormTypeExtensionInterface::configureOptions()` method
+
 2.7.0
 -----
 
- * deprecated the overwriting of AbstractType::setDefaultOptions() in favor of overwriting AbstractType::configureOptions().
- * deprecated the overwriting of AbstractTypeExtension::setDefaultOptions() in favor of overwriting AbstractTypeExtension::configureOptions().
+ * deprecated the overwriting of `AbstractType::setDefaultOptions()` in favor of overwriting `AbstractType::configureOptions()`.
+ * deprecated the overwriting of `AbstractTypeExtension::setDefaultOptions()` in favor of overwriting `AbstractTypeExtension::configureOptions()`.
 
 2.6.2
 -----