Changelog for v2.26.0 (#513)

Signed-off-by: Teju Nareddy <[email protected]>

CHANGELOG.md

@@ -1,3 +1,12 @@
+# Release 2.26.0 13-05-2021
+
+- Upgrade to Envoy v1.18.3
+- Add path normalization options for CVE-2021-29492 (#511)
+- Add flag `--cors_max_age` to support set Access-Control-Max-Age response header (#502)
+- Add perTryTimeout for doing retry when the upstream times out (#509)
+- Support for "eu" zone via -z in gcloud_build_image (#490)
+- Propagate trace context headers to Service Control Check (#487)
+
 # Release 2.25.0 23-02-2021
 
 - Add flags to add extra headers (#480)