Removing language specifiers from README.md source blocks.

README.md

@@ -10,12 +10,10 @@ Installation
 [`react-whitelabel`](https://www.npmjs.com/package/react-whitelabel)
 is availabile in the NPM registry.
 
-    shell
     > npm i react-whitelabel
 
 or
 
-    shell
     > yarn add react-whitelabel
 
 
@@ -24,7 +22,6 @@ Example
 
 **app.js**:
 
-    javascript
     import React from 'react';
     import { WhiteLabelProvider } from 'react-whitelabel';
     import Header from './Header';
@@ -53,7 +50,6 @@ Example
 
 **Header.jsx**:
 
-    javascript
     import React from "react";
     import { withWhiteLabelContext } from 'react-whitelabel';