Fix output name

Author: pyt0xic

completion/README.fish.md

@@ -3,7 +3,7 @@
 ## Installation
 Download and place the completion file in your fish completions directory
 ```fish
-$ set target "$HOME/.config/fish/completions/paket-completion.fish"
+$ set target "$HOME/.config/fish/completions/paket.fish"
 $ curl --fail --location --proto-redir -all,https --output "$target" \
   https://raw.githubusercontent.com/fsprojects/Paket/master/completion/paket-completion.fish
 ```