Bump strip-ansi (#4474)

Author: compulim

CHANGELOG.md

@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 -  Card action image alt text should use `imageAltText` field and fallback to `text` field, by [@compulim](https://github.com/compulim) in PR [#4333](https://github.com/microsoft/BotFramework-WebChat/pull/4333)
 -  Fixes [#4472](https://github.com/microsoft/BotFramework-WebChat/issues/4472). Removed `role` attributes for notification bar and use `<div>` instead of `<ul>`/`<li>`, by [@compulim](https://github.com/compulim) in PR [#4475](https://github.com/microsoft/BotFramework-WebChat/pull/4475)
 -  Fixes [#4393](https://github.com/microsoft/BotFramework-WebChat/issues/4393). Renders `<section role="feed">` only if there are one or more activities contained within, by [@beyackle2](https://github.com/beyackle2) and [@compulim](https://github.com/compulim), in PR [#4420](https://github.com/microsoft/BotFramework-WebChat/pull/4420)
+-  Fixes [#4473](https://github.com/microsoft/BotFramework-WebChat/issues/4473). Bumped `strip-ansi@6.0.1` for `test-harness` as `@^7` does not support CommonJS project, by [@compulim](https://github.com/compulim) in PR [#4474](https://github.com/microsoft/BotFramework-WebChat/pull/4474)
 
 ### Changed