Update install-advanced.md

add new domain for proxy
googlechromelabs.github.io

Author: tpurschke

documentation/installer/install-advanced.md

@@ -76,6 +76,7 @@ Note that the following domains must be reachable through the proxy:
     microsoft.com     
     nuget.org
     storage.googleapis.com
+    googlechromelabs.github.io
 
   Only for the initial setup of python venv