smug: add completion support

Signed-off-by: Rui Chen <[email protected]>

Author: chenrui333

Formula/s/smug.rb

@@ -18,6 +18,9 @@ class Smug < Formula
 
   def install
     system "go", "build", *std_go_args(ldflags: "-s -w -X main.version=#{version}")
+
+    bash_completion.install "completion/smug.bash" => "smug"
+    fish_completion.install "completion/smug.fish"
   end
 
   test do