A+C: add Kush Patel (corporate CLA for Hootsuite Inc)

I'm from Hootsuite. We're a Canadian tech company who provides products
and services to businesses, organizations and individuals to really help
them succeed on social. We have leveraged Go in our stack for the past
4+ years. I am super happy to give back to Go on behalf of Hootsuite
through a small contribution to pkgsite (with a few more in the works).
We love this project and we love open source :)

Hopefully we can give back more in the future!
Kush

Change-Id: Id534a41d78e17e1fa48a8ddecd1ca110cf812388
GitHub-Last-Rev: 297b8b06e75c3ce485f62677ce4591c5cabe8008
GitHub-Pull-Request: golang/go#40088
Reviewed-on: https://go-review.googlesource.com/c/go/+/241218


Reviewed-by: Julie Qiu <julie@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>