Update formulat

Formula/gh.rb

@@ -1,12 +1,12 @@
 class Gh < Formula
   desc "GitHub CLI"
-  head "https://github.com/github/gh-cli.git", :branch => "prototype"
+  url "https://github.com/github/homebrew-gh/releases/download/v0.0.1/gh-cli_0.0.1_darwin_amd64.tar.gz"
+  sha256 "8890ac5a60b1cceab4186cb2cf3129b955cb4122ce9c37aa936015139be986b1"
 
-  depends_on "go" => :build
+  bottle :unneeded
 
   def install
-    system "make"
-    bin.install "bin/gh"
+    bin.install "gh"
     (bash_completion/"gh.sh").write `#{bin}/gh completion -s bash`
     (zsh_completion/"_gh").write `#{bin}/gh completion -s zsh`
   end
@@ -15,4 +15,4 @@ class Gh < Formula
     help_text = shell_output("#{bin}/gh --help")
     assert_includes help_text, "Usage:"
   end
-end
+end