Update README.md

README.md

@@ -41,9 +41,8 @@ $ sudo apt update && sudo apt upgrade
 $ sudo apt install git vim libcap2-bin p7zip-full p7zip-rar curl gnupg nginx
 $ sudo snap install --classic certbot
 $ sudo ln -s /snap/bin/certbot /usr/bin/certbot
-$ curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
-$ echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
-$ sudo apt update && sudo apt install yarn
+$ corepack enable
+$ corepack prepare yarn@stable --activate
 # check version
 $ yarn --version
 ```