Newer way of installing fisher package manager

.config/fish/config.fish

@@ -7,7 +7,7 @@ if not functions -q fisher
     echo "Installing fisher for the first time..." >&2
     set -q XDG_CONFIG_HOME; or set XDG_CONFIG_HOME ~/.config
     curl https://git.io/fisher --create-dirs -sLo $XDG_CONFIG_HOME/fish/functions/fisher.fish
-    fisher
+    fish -c fisher
 end
 
 # Virtualenv support with virtualfish