M65 changelog for FIAM SDK (#4924)

* Update CHANGELOG.md

* change wording

Author: rohandandavati

FirebaseInAppMessaging/CHANGELOG.md

@@ -1,3 +1,6 @@
+# 2020-02-18 -- v0.17.0
+- [added] Added support for data bundles for in-app messages. Data bundles are additional key-value pairs that can be sent along with an in-app message (#4922).
+
 # 2020-01-28 -- v0.16.0
 - [changed] Consolidated backend and UI SDKs under `FirebaseInAppMessaging`. Developers should now use `pod Firebase/InAppMessaging` in their Podfile.
 - [changed] `FIRIAMDefaultDisplayImpl` is no longer public.