Update guides-use-prompt.md (#320)

The `npm install` part referenced the wrong list of packages.

Author: guidobouman

docs/guides-use-prompt.md

@@ -12,7 +12,7 @@ git init
 npm init
 
 # Install and configure if needed
-npm install --save-dev @commitlint/{cli,angular,prompt-cli}
+npm install --save-dev @commitlint/{cli,config-conventional,prompt-cli}
 echo "module.exports = {extends: ['@commitlint/config-conventional']};" > commitlint.config.js
 ```