docs(readme.md): update latest version

Author: BcRikko

.github/README-es.md

@@ -32,7 +32,7 @@ Importa el CSS utiliando un elemento `<link />`:
 
 ```html
 <!-- minificado -->
-<link href="https://unpkg.com/nes.css@2.0.0/css/nes.min.css" rel="stylesheet" />
+<link href="https://unpkg.com/nes.css@2.1.0/css/nes.min.css" rel="stylesheet" />
 <!-- último -->
 <link href="https://unpkg.com/nes.css@latest/css/nes.min.css" rel="stylesheet" />
 <!-- solo estilo del núcleo -->

.github/README-jp.md

@@ -32,7 +32,7 @@ yarn add nes.css
 
 ```html
 <!-- 圧縮版 -->
-<link href="https://unpkg.com/nes.css@2.0.0/css/nes.min.css" rel="stylesheet" />
+<link href="https://unpkg.com/nes.css@2.1.0/css/nes.min.css" rel="stylesheet" />
 <!-- 最新版 -->
 <link href="https://unpkg.com/nes.css@latest/css/nes.min.css" rel="stylesheet" />
 <!-- コアスタイルのみ -->

.github/README-pt-BR.md

@@ -32,7 +32,7 @@ Importe o CSS através de um elemento `<link />`:
 
 ```html
 <!-- minify -->
-<link href="https://unpkg.com/nes.css@2.0.0/css/nes.min.css" rel="stylesheet" />
+<link href="https://unpkg.com/nes.css@2.1.0/css/nes.min.css" rel="stylesheet" />
 <!-- latest -->
 <link href="https://unpkg.com/nes.css@latest/css/nes.min.css" rel="stylesheet" />
 <!-- core style only -->

.github/README-zh-CN.md

@@ -22,7 +22,7 @@ yarn add nes.css
 
 ```html
 <!-- non-minified -->
-<link href="https://unpkg.com/nes.css@2.0.0/css/nes.min.css" rel="stylesheet" />
+<link href="https://unpkg.com/nes.css@2.1.0/css/nes.min.css" rel="stylesheet" />
 <!-- latest -->
 <link href="https://unpkg.com/nes.css@latest/css/nes.min.css" rel="stylesheet" />
 <!-- core style only -->

README.md

@@ -32,7 +32,7 @@ Import the CSS via a `<link />` element:
 
 ```html
 <!-- minify -->
-<link href="https://unpkg.com/nes.css@2.0.0/css/nes.min.css" rel="stylesheet" />
+<link href="https://unpkg.com/nes.css@2.1.0/css/nes.min.css" rel="stylesheet" />
 <!-- latest -->
 <link href="https://unpkg.com/nes.css@latest/css/nes.min.css" rel="stylesheet" />
 <!-- core style only -->