docs: move example below Usage section

Author: cAttte

readme.md

@@ -4,7 +4,11 @@
 
 An object-oriented JavaScript wrapper for the Pastebin API.
 
-## Quick Example
+## Installation
+
+    $ npm install @catte_/pastebin.js
+
+## Usage
 
 ```js
 const { PastebinClient } = require("@catte_/pastebin.js")
@@ -18,12 +22,6 @@ const paste = await pastebin.pastes.create("console.log('hello, world')", {
 console.log(paste.url)
 ```
 
-## Installation
-
-    $ npm install @catte_/pastebin.js
-
-## Usage
-
 -   [Classes](#classes)
     -   [PastebinClient](#pastebinclient)
     -   [PastebinError](#pastebinerror-extends-error)