doc: add Kevin to the list of collaborators (#539)

Kevin has been active in helping answer questions, submitting
PRs and helping to move n-api and node-addon-api forward. Believe
it's time to add him formally to the team here as well.

PR-URL: nodejs/node-addon-api#539
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

README.md

@@ -184,6 +184,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for more details on our philosophy around
 | Hitesh Kanwathirtha | [digitalinfinity](https://github.com/digitalinfinity) |
 | Jim Schlight        | [jschlight](https://github.com/jschlight)             |
 | Michael Dawson      | [mhdawson](https://github.com/mhdawson)               |
+| Kevin Eady          | [KevinEady](https://github.com/KevinEady)
 | Nicola Del Gobbo    | [NickNaso](https://github.com/NickNaso)               |
 | Taylor Woll         | [boingoing](https://github.com/boingoing)             |