GoUsers: add Pethost

Change-Id: I94fdceffa407e04f0088921d348acfe237599945
GitHub-Last-Rev: 170c14ff877eaa6f94b6b98fa80d2ff88f75635d
GitHub-Pull-Request: golang/wiki#111
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/849885
Reviewed-by: Sean Liao <sean@liao.dev>

GoUsers.md

diff --git a/GoUsers.md b/GoUsers.md
index c5b56ea..e8ad8ea 100644
--- a/GoUsers.md
+++ b/GoUsers.md
@@ -1209,6 +1209,7 @@
 - [Brainly](https://brainly.co/) - [blog](https://medium.com/engineering-brainly)
 - [limango](https://www.limango.pl/)
 - [SoftKraft](https://www.softkraft.co/golang-development-company/) - software development company
+- [Pethost](https://pethost.dev)
 
 ### Portugal