Update changelog.

Author: davidlehn

CHANGELOG.md

@@ -21,7 +21,8 @@
 ### Added
 - Testing: `skip` and `only` flags in manifests.
 - Testing: `VERBOSE_SKIP=true` env var to debug skipping.
-- Support `@protected` and `protectedMode`.
+- Support `@protected`.
+- Support experimental non-standard `protectedMode` option.
 
 ## 1.5.4 - 2019-02-28