update changelog (#2513)

Author: stobrien89

.changes/nextrelease/enhancement-header-blacklist-visibility.json

@@ -1,5 +1,7 @@
-{
-    "type": "enhancement", 
-    "category": "Signature",
-    "description": "The visibility of the SignatureV4::getHeaderBlacklist() method has been changed from private to protected to allow overriding the method in extending classes. By default this method prevents headers from being signed to avoid issues with signature mismatches when sending requests through proxies; however you may want to be able to force some headers to be signed for request integrity reasons."
-}
+[
+    {
+        "type": "enhancement", 
+        "category": "Signature",
+        "description": "The visibility of the SignatureV4::getHeaderBlacklist() method has been changed from private to protected to allow overriding the method in extending classes. By default this method prevents headers from being signed to avoid issues with signature mismatches when sending requests through proxies; however you may want to be able to force some headers to be signed for request integrity reasons."
+    }
+]