fish-shell: removed unnecessary INSTALL file

srcpkgs/fish-shell/INSTALL

@@ -1,11 +0,0 @@
-case "$ACTION" in
-  post)
-    if [ "$UPDATE" = "no" ]; then
-      echo "--> To run fish, type 'fish' in your terminal."
-      echo "--> To set your colors, run 'fish_config'"
-      echo "--> To scan your man pages for completions, run 'fish_update_completions'"
-      echo "--> To autocomplete command suggestions press Ctrl + F or right arrow key."
-      echo "--> To use fish as your login shell, run 'chsh -s /usr/bin/fish"
-    fi
-    ;;
-esac