add types property to package.json for typescript 2.0

[hodavidhara]

Trying to use popsicle with typescript 2.0 gave me the error: test.ts (1,22): Cannot find module 'popsicle'. (2307)

According to https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html it seem like a types or typings property needs to be added.

[blakeembrey]

No thanks. You need to use Typings to install the module. I'll be happy to use TypeScript @types once they support redirects, but until then all my tooling requires Typings because of the dependencies. If there was no dependencies, I'd already be using the typings field - this is not is a new TypeScript 2.0 feature and has existed since 1.5.