Add significant whitespace to fix headers on npm (#569)

Readme.md

@@ -21,6 +21,7 @@ _**Slate is currently in beta**. It's useable now, but you might need to pull re
 
 
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 ### Why?
 
 Why create Slate? Well... _(Beware: this section has a few of [my](https://github.com/ianstormtaylor) opinions!)_
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 ### Principles
 
 Slate tries to solve the question of "[Why?](#why)" with a few principles:
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 ### Demo
 
 Check out the [**live demo**](http://slatejs.org) of all of the examples!
 
 
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 ### Examples
 
 To get a sense for how you might use Slate, check out a few of the examples:
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 ### Plugins
 
 Slate encourages you to write small, reusable modules. Check out the public ones you can use in your project!
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 - [**View all plugins on `npm`...**](https://www.npmjs.com/browse/keyword/slate)
 
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 ### Documentation
 
 If you're using Slate for the first time, check out the [Getting Started](http://docs.slatejs.org/walkthroughs/installing-slate.html) walkthroughs to familiarize yourself with Slate's architecture and mental models. Once you've gotten familiar with those, you'll probably want to check out the full [API Reference](http://docs.slatejs.org/reference/components/editor.html).
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 ### Contributing!
 
 All contributions are super welcome! Check out the [Contributing instructions](./Contributing.md) for more info!