Fixed readme

Author: kyranet

README.md

@@ -4,7 +4,7 @@ A ES6 function for node-canvas with built-in functions and chained methods.
 How to use it:
 
 ```js
-const { Canvas } = require('canvasConstructor');
+const { Canvas } = require('canvas-constructor');
 
 new Canvas(300, 300)
     .setColor('#AEFD54')
@@ -26,7 +26,7 @@ new Canvas(300, 300)
 Now, let's suppose we want to add images. I'd recommend [fs-nextra](https://github.com/bdistin/fs-nextra), by BDISTIN, it requires Node.js 8.1.0 to work (it promisifies the async fs methods with `Util.promisify()`), it's a dependency-free and lightweight package that provides support for **atomic operations**.
 
 ```js
-const { Canvas } = require('canvasConstructor');
+const { Canvas } = require('canvas-constructor');
 const fsn = require('fs-nextra');
 
 async function createCanvas() {