Update CHANGELOG.md to include #4696

CHANGELOG.md

@@ -24,6 +24,7 @@ IMPROVEMENTS:
 * `azurerm_cognitive_account` - support for the sku `F1` [GH-4720]
 * `azurerm_cosmosdb_mongo_collection` - add support for the `throughput` property [GH-4467]
 * `azurerm_firewall` - support for `zones` [GH-4670]
+* `azurerm_function_app` - add support for the `http2_enabled `property [GH-4696]
 * `azurerm_frontdoor` - update `custom_host` to be optional, add `redirect_configuration` to documentation. [GH-4601]
 * `azurerm_kubernetes_cluster` - allow the `aci_connector_linux` to be disabled by allowing the subnet property be empty [GH-4541]
 * `azurerm_kubernetes_cluster` - add support for the `azure_policy` property in the `addon_profile` block [GH-4498]