go-tour: update link to Simplified Chinese translation
The version on App Engine can't be accessed by most Chinese, so
we host a local version.
LGTM=adg
R=adg
CC=golang-codereviews
https://golang.org/cl/199970043
diff --git a/content/welcome.article b/content/welcome.article
index 4f47d30..c3bf819 100644
--- a/content/welcome.article
+++ b/content/welcome.article
@@ -55,7 +55,7 @@
- [[http://go-tour-jp.appspot.com/][Japanese — 日本語]]
- [[http://go-tour-kr.appspot.com/][Korean — 한국어]]
- [[http://go-tour-ro.appspot.com/][Romanian - Română]]
-- [[http://go-tour-zh.appspot.com/][Simplified Chinese — 中文（简体）]]
+- [[http://tour.go-zh.org/][Simplified Chinese — 中文（简体）]]
- [[http://go-tour-zh-tw.appspot.com/][Traditional Chinese — 中文（繁體）]]
Click the [[javascript:highlightAndClick(".next-page")]["next"]] button or type `PageDown` to continue.
