improve README formatting

README.MD

@@ -2,17 +2,15 @@
 
 Test your web application with the [axe-core](https://github.com/dequelabs/axe-core) accessibility testing library. Results will show in the browser console.
 
-## Usage
+## Installation
 
 Install the module from NPM.
 
 ```sh
 npm install --save-dev agnostic-axe
 ```
 
-## Initialize the module
-
-Intialize the exported class.
+## Usage
 
 ```js
 if (process.env.NODE_ENV !== 'production') {
@@ -32,8 +30,8 @@ The `AxeReporter` constructor takes two optional parameters:
 
 - The first optional parameter is `targetNode`, and determines which element is audited. It defaults to `document.body`.
 - The second optional parameter is `analyseTimeout`, it determines the time within the element should be re-analyzed after a mutation was observed. It defaults to `1000` (1 second).
-- The is a third optional parameter `axeConfig` is a configuration object for axe-core. Read about the object here at https://github.com/dequelabs/axe-core/blob/master/doc/API.md#api-name-axeconfigure and the see `agnostic-axe` source code for the default configuration.
+- The is a third optional parameter `axeConfig` is a configuration object for [axe-core](https://github.com/dequelabs/axe-core). Read about the object at https://github.com/dequelabs/axe-core/blob/master/doc/API.md#api-name-axeconfigure and the see agnostic-axe source code for the default configuration.
 
-### Credits
+## Credits
 
-Agnostic axe itself is merely a wrapper around [axe-core](https://github.com/dequelabs/axe-core) that employs a `MutationObserver` to detect DOM changes automatically. Most of its logic for formatting violations return by [axe-core](https://github.com/dequelabs/axe-core) is taken from [react-axe](https://github.com/dequelabs/react-axe)
+Agnostic axe itself is merely a wrapper around [axe-core](https://github.com/dequelabs/axe-core) that employs a `MutationObserver` to detect DOM changes automatically. Most of its logic for formatting violations return by [axe-core](https://github.com/dequelabs/axe-core) is taken from [react-axe](https://github.com/dequelabs/react-axe).