minor #20986 [HttpFoundation] update changelog (xabbuh)

This PR was merged into the 3.3-dev branch.

Discussion
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[HttpFoundation] update changelog

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #20569
| License       | MIT
| Doc PR        |

Commits
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e91a654 [HttpFoundation] update changelog

Author: fabpot

CHANGELOG.md

@@ -1,6 +1,12 @@
 CHANGELOG
 =========
 
+3.3.0
+-----
+
+ * added the `Cookie::fromString()` method that allows to create a cookie from a
+   raw header string
+
 3.1.0
 -----