devDependency updates for v8.1.0

Signed-off-by: Christopher Hiller <boneskull@boneskull.com>

update CHANGELOG

Signed-off-by: Christopher Hiller <boneskull@boneskull.com>

CHANGELOG.md

@@ -1,12 +1,12 @@
-# 8.1.0 / 2020-07-29
+# 8.1.0 / 2020-07-30
 
 In this release, Mocha now builds its browser bundle with Rollup and Babel, which will provide the project's codebase more flexibility and consistency.
 
 While we've been diligent about backwards compatibility, it's _possible_ consumers of the browser bundle will encounter differences (other than an increase in the bundle size). If you _do_ encounter an issue with the build, please [report it here](https://github.com/mochajs/mocha/issues/new?labels=unconfirmed-bug&template=bug_report.md&title=).
 
 This release **does not** drop support for IE11.
 
-Other community contributions came from [**@Devjeel**](https://github.com/Devjeel) and [**@sharath2106**](https://github.com/sharath2106). _Thank you_ to everyone who contributed to this release!
+Other community contributions came from [**@Devjeel**](https://github.com/Devjeel), @Harsha509 and [**@sharath2106**](https://github.com/sharath2106). _Thank you_ to everyone who contributed to this release!
 
 > Do you read Korean? See [this guide to running parallel tests in Mocha](https://blog.outsider.ne.kr/1489), translated by our maintainer, [**@outsideris**](https://github.com/outsideris).