Updates README.md with a better alias suggestion

`ld` is actually a pretty important command-line tool, so overwriting it with the suggested alias is not preferable. `lzd` is just my idea, but really this is just to notify you.

README.md

@@ -53,7 +53,7 @@ go get github.com/jesseduffield/lazydocker
 Call `lazydocker` in your terminal. I personally use this a lot so I've made an alias for it like so:
 
 ```
-echo "alias ld='lazydocker'" >> ~/.zshrc
+echo "alias lzd='lazydocker'" >> ~/.zshrc
 ```
 
 (you can substitute .zshrc for whatever rc file you're using)