[readme] fix LTS upgrade command

Edited the LTS upgrade scenario command to fix the issue discussed in #2271
diff --git a/README.md b/README.md
index 688b30b..57029ab 100644
--- a/README.md
+++ b/README.md
@@ -293,7 +293,7 @@
 To get the latest LTS version of node and migrate your existing installed packages, use
 
 ```sh
-nvm install --lts --reinstall-packages-from=current
+nvm install 'lts/*' --reinstall-packages-from=current
 ```
 
 ### Migrating Global Packages While Installing