skeleton code bump dev-cmd file

Library/Homebrew/dev-cmd/bump.rb

@@ -0,0 +1,19 @@
+require "cli/parser"
+
+module Homebrew
+  module_function
+
+  def bump_args
+    Homebrew::CLI::Parser.new do
+      usage_banner <<~EOS
+        `bump`
+
+        Display out-of-date brew formulae, the latest version available, and whether a pull request has been opened.
+      EOS
+    end
+  end
+
+  def bump
+    bump_args.parse
+  end
+end