chore: release functions 0.2.0 (#4758)

diff --git a/functions/CHANGES.md b/functions/CHANGES.md
index 1e5d3f2..c3d7f9e 100644
--- a/functions/CHANGES.md
+++ b/functions/CHANGES.md
@@ -1,5 +1,12 @@
 # Changes
 
+## [0.2.0](https://www.github.com/googleapis/google-cloud-go/compare/functions/v0.1.0...functions/v0.2.0) (2021-09-16)
+
+
+### Features
+
+* **functions:** add SecurityLevel option on HttpsTrigger ([8ffed36](https://www.github.com/googleapis/google-cloud-go/commit/8ffed36c9db818a24073cf865f626d29afd01716))
+
 ## v0.1.0
 
 This is the first tag to carve out functions as its own module. See