docs(changelog): add zlib and compiler-rt scope

Change-Id: Id98ca7762fd17cb793b0ec9119d0b026195cf2c2
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
diff --git a/changelog.yaml b/changelog.yaml
index fac15a7..8fcb217 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -1181,8 +1181,15 @@
       - title: commitlint
         scope: commitlint
 
+      - title: Compiler runtime libraries
+        scope: compiler-rt
+
       - title: libfdt
         scope: libfdt
 
       - title: Node Package Manager (NPM)
         scope: npm
+
+      - title: zlib
+        scope: zlib
+