modify CHANGELOG.md

Author: ChrisdeR

CHANGELOG.md

@@ -5,6 +5,10 @@ FEATURES:
 * **New Resource**: `tencentcloud_kms_key`
 * **New Resource**: `tencentcloud_kms_external_key`
 * **New Data Source**: `tencentcloud_kms_keys` 
+* **New Resource**: `tencentcloud_ssm_secret`
+* **New Resource**: `tencentcloud_ssm_secret_version`
+* **New Data Source**: `tencentcloud_ssm_secrets` 
+* **New Data Source**: `tencentcloud_ssm_secret_versions` 
 
 ## 1.53.9 (March 19, 2021)