Add avisionh to contributors

This is for contributing to the travis deployments chapter.

Author: avisionh

guide/src/misc/contributors.md

@@ -16,5 +16,6 @@ shout-out to them!
 - [Phaiax](https://github.com/Phaiax)
 - Matt Ickstadt ([mattico](https://github.com/mattico))
 - Weihang Lo ([@weihanglo](https://github.com/weihanglo))
+- Avision Ho ([@avisionh](https://github.com/avisionh))
 
-If you feel you're missing from this list, feel free to add yourself in a PR.
+If you feel you're missing from this list, feel free to add yourself in a PR.