message: docs(readme): structure
diff: -# :ocean: React Flow
  +![react-flow](https://user-images.githubusercontent.com/2857535/67417109-516ef000-f5c8-11e9-938a-c2121d3ebbe4.png)
  -React library for building node-based graphs.
  +# :ocean: React Flow
  -![react-flow](https://user-images.githubusercontent.com/2857535/67416769-b413bc00-f5c7-11e9-8890-b01bea761971.png)
  +React Flow is a library for building node-based graphs. You can easily implement custom node types and it comes with plugins like a MiniMap and a Controls Panel.
  - [Installation](#installation)
  - [Usage](#usage)
  - [Props](#props)
  - [Nodes](#nodes)
  - - [Props](#props)
  + - [Props](#props-1)
  - [Node Types / Custom Nodes](#node-types--custom-nodes)
  - [Edges](#nodes)
  - - [Props](#props)
  + - [Props](#props-2)
  - [Edge Types / Custom Edges](#edge-types--custom-edges)
  - [Plugins](#plugins)
  - [Minimap](#minimap)
  - [Controls](#controls)
  -# Installation
  +## Installation
  ```
  npm install github:wbkd/react-flow
  ```
  -# Usage
  +## Usage
  This is a very basic example of how to use react-flow. There are more advanced examples in the [example](/example/src) folder.
  @@ -148,9 +148,9 @@ edgeTypes={{
  You can now use type `special` for an edge.
  The `straight`, `default` and `step` types will be still available except you overwrite one of them.
  -# Plugins
  +## Plugins
  -## MiniMap
  +### MiniMap
  You can use the MiniMap plugin by passing it as a children of you graph:
  @@ -166,7 +166,7 @@ const GraphWithMiniMap = () => (
  );
  ```
  -**Props**
  +#### Props
  - `nodeColor`: string | function - if you pass a color as a string all nodes will get that color. If you pass a function you can return a color depending on the node.
  - `nodeBorderRadius`: number
  @@ -174,7 +174,7 @@ const GraphWithMiniMap = () => (
  - `style`: css properties
  - `className`: class name
  -## Controls
  +### Controls
  The control panel contains a zoom-in, zoom-out and a fit-view button. You can use it by passing it as children to your graph:
  @@ -190,7 +190,7 @@ const GraphWithControls = () => (
  );
  ```
  -**Props**
  +#### Props
  - `style`: css properties
  - `className`: class name
  