docs: add changes for upcoming version

Signed-off-by: Maximilian Bösing <2189546+boesing@users.noreply.github.com>

Author: boesing

CHANGELOG.md

@@ -2,11 +2,4 @@
 
 ## Added
 
-- Adds `UriIntegrationTest::testGetPathNormalizesMultipleLeadingSlashesToSingleSlashToPreventXSS()`, `UriIntegrationTest::testStringRepresentationWithMultipleSlashes(array $test)`, and `RequestIntegrationTest::testGetRequestTargetInOriginFormNormalizesUriWithMultipleLeadingSlashesInPath()`.
-  These validate that a path containing multiple leading slashes is (a) represented with a single slash when calling `UriInterface::getPath()`, and (b) represented without changes when calling `UriInterface::__toString()`, including when calling `RequestInterface::getRequestTarget()` (which returns the path without the URI authority by default, to comply with origin-form).
-  This is done to validate mitigations for [CVE-2015-3257](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3257).
-
-## Changed
-
-- Modifies `UriIntegrationTest::testPathWithMultipleSlashes()` to only validate multiple slashes in the middle of a path.
-  Multiple leading slashes are covered with the newly introduced tests.
+- Support for `psr/http-message` v2