Edit readme

Can you please add these content add the bottom of the ReadMe. I'll add necessary links after the edit.

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## Fast Render 2.x vs 1.x

There is no much difference for you, but 2.x is deeply integrated to Meteor and it will have almost zero DDP related issues.

#### Iron Router

Fast Render 1.x used to work with almost all versions of Iron Router. But Fast Render 2.x only works with Iron Router version 0.9 and 1.x only.

Earlier, Fast Render comes with it's own Iron Router controller called `FastRender.RouteController`. You could use that to add Fast Render support to that RouteController.

Now, you've to set `fastRender:true` option in the route level and there is no `FastRender.RouteController`.

#### Unused APIs

Fast Render 1.x comes with a lot of additional APIs. Now [these](#some-link) are the only API's comes with Fast Render.

* FastRender.route(<route-def>, <callback>)
* FastRender.onAllRouters(<callback>)

#### Debugger

Fast Render 2.x comes with a it's own debugger where you can use to check whether Fast Render is working or not. It has some handly tools.
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