Packages with a package.json:deno entry

[balupton]

https://github.com/bevry/make-deno-edition creates deno compatible editions and updates the package.json file with a deno field that points to a deno compatible entry file, it also adds a deno-entry keyword so that compatible packages can be found on the npm registry: https://www.npmjs.com/search?q=keywords:deno-entry