message: docs: Remove greenkeeper reference from readme, as it is being retired
diff: @@ -29,12 +29,10 @@ This tool seeks to be a one-stop shop for building and working with rust-
  generated WebAssembly that you would like to interop with JavaScript, in the
  browser or with Node.js. `wasm-pack` helps you build rust-generated
  WebAssembly packages that you could publish to the npm registry, or otherwise use
  -alongside any javascript packages in workflows that you already use, such as [webpack]
  -or [greenkeeper].
  +alongside any javascript packages in workflows that you already use, such as [webpack].
  [bundler-support]: https://github.com/rustwasm/team/blob/master/goals/bundler-integration.md#details
  [webpack]: https://webpack.js.org/
  -[greenkeeper]: https://greenkeeper.io/
  This project is a part of the [rust-wasm] group. You can find more info by
  visiting that repo!
  