Fix contribution docs about gulp-cli (#5968)

Update the docs so that only gulp-cli is installed globally

diff --git a/docs/developers/contributing.md b/docs/developers/contributing.md
index 13f8e4429c6e421330bdb67ff493edc586fec79e..2fe3ee266bdf6d57f42ebe3138b84018ceca257a 100644 (file)
--- a/docs/developers/contributing.md
+++ b/docs/developers/contributing.md
@@ -22,7 +22,7 @@ Firstly, we need to ensure development dependencies are installed. With node and
 
 ```bash
 > npm install
-> npm install -g gulp
+> npm install -g gulp-cli
 ```
 
 This will install the local development dependencies for Chart.js, along with a CLI for the JavaScript task runner <a href="https://gulpjs.com/" target="_blank">gulp</a>.