message: Update polymer.json link to 2.0 version
  The link to the `polymer.json` was still pointing to the 1.0 version
  of the docs. This updates the link to the 2.0 version
diff: @@ -35,7 +35,7 @@ Check out the [custom-build generator](https://github.com/PolymerElements/genera
  `PolymerProject` represents your project in the build pipeline. Once configured, it will give you access to a collection of streams and helpers for building your project.
  -To create a new instance of `PolymerProject`, you'll need to give it some information about your application. If you already have a [`polymer.json`](https://www.polymer-project.org/1.0/docs/tools/polymer-cli#build) configuration file in your project, you can create a new `PolymerProject` instance by loading it directly:
  +To create a new instance of `PolymerProject`, you'll need to give it some information about your application. If you already have a [`polymer.json`](https://www.polymer-project.org/2.0/docs/tools/polymer-json) configuration file in your project, you can create a new `PolymerProject` instance by loading it directly:
  ```js
  const PolymerProject = require('polymer-build').PolymerProject;
  