install gulp to process code

node_modules/gulp-cli/completion/fish

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+#!/usr/bin/env fish
+
+# Usage:
+#
+# To enable fish <tab> completion for gulp, add the following line to
+# your ~/.config/fish/config.fish file:
+#
+# gulp --completion=fish | source
+
+complete -c gulp -a "(gulp --tasks-simple)" -f