Use version in npm install

Closes #4832.

Author: code-asher

Diff for: install.sh

@@ -424,7 +424,7 @@ install_standalone() {
 }
 
 install_npm() {
-  echoh "Installing latest from npm."
+  echoh "Installing v$VERSION from npm."
   echoh
 
   NPM_PATH="${YARN_PATH-npm}"
@@ -436,7 +436,7 @@ install_npm() {
     fi
     echoh "Installing with npm."
     echoh
-    "$sh_c" "$NPM_PATH" install -g code-server --unsafe-perm
+    "$sh_c" "$NPM_PATH" install -g "code-server@$VERSION" --unsafe-perm
     NPM_BIN_DIR="\$($NPM_PATH bin -g)" echo_npm_postinstall
     return
   fi