update branch in URLs

install.sh

@@ -2,7 +2,7 @@
 set -eu
 
 # code-server's automatic install script.
-# See https://github.com/cdr/code-server/blob/master/docs/install.md
+# See https://github.com/cdr/code-server/blob/v3.8.1/docs/install.md
 
 usage() {
   arg0="$0"
@@ -67,7 +67,7 @@ Usage:
 
 It will cache all downloaded assets into ~/.cache/code-server
 
-More installation docs are at https://github.com/cdr/code-server/blob/master/docs/install.md
+More installation docs are at https://github.com/cdr/code-server/blob/v3.8.1/docs/install.md
 EOF
 }
 
@@ -419,7 +419,7 @@ install_npm() {
   echoh
   echoerr "Please install npm or yarn to install code-server!"
   echoerr "You will need at least node v12 and a few C dependencies."
-  echoerr "See the docs https://github.com/cdr/code-server/blob/master/docs/install.md#yarn-npm"
+  echoerr "See the docs https://github.com/cdr/code-server/blob/v3.8.1/docs/install.md#yarn-npm"
   exit 1
 }