doc: update docs/kotlin.md (#515)

* 新增Kotlin的高阶函数用法

* 新增和调整若干Kotlin示例代码
[新增] 扩展函数
[新增] 运算符重载
[新增] 中缀表达式
[新增] 次构造函数
[新增] Data 数据类
[新增] 内部类
[新增] object 单例类
[修改] 主构造函数示范代码，调整了部分缩进和变量定义。 2f6c263221

index.html

@@ -915,9 +915,6 @@
 <a href="https://github.com/webeautiful" title="Albert">
   <img src="https://avatars.githubusercontent.com/u/3364316?v=4" width="42;" alt="Albert">
 </a>
-<a href="https://github.com/yanxuplay" title="hupilan">
-  <img src="https://avatars.githubusercontent.com/u/69749541?v=4" width="42;" alt="hupilan">
-</a>
 <a href="https://github.com/hweining" title="hweining">
   <img src="https://avatars.githubusercontent.com/u/8973985?v=4" width="42;" alt="hweining">
 </a>
@@ -948,6 +945,12 @@
 <a href="https://github.com/larry-xue" title="larry">
   <img src="https://avatars.githubusercontent.com/u/48818060?v=4" width="42;" alt="larry">
 </a>
+<a href="https://github.com/Zeng-qh" title="都一样">
+  <img src="https://avatars.githubusercontent.com/u/40046415?v=4" width="42;" alt="都一样">
+</a>
+<a href="https://github.com/yanxuplay" title="hupilan">
+  <img src="https://avatars.githubusercontent.com/u/69749541?v=4" width="42;" alt="hupilan">
+</a>
 <a href="https://github.com/hua03" title="hua03">
   <img src="https://avatars.githubusercontent.com/u/19561959?v=4" width="42;" alt="hua03">
 </a>
@@ -981,9 +984,6 @@
 <a href="https://github.com/zlfyuan" title="bgbgPang">
   <img src="https://avatars.githubusercontent.com/u/19658018?v=4" width="42;" alt="bgbgPang">
 </a>
-<a href="https://github.com/Zeng-qh" title="都一样">
-  <img src="https://avatars.githubusercontent.com/u/40046415?v=4" width="42;" alt="都一样">
-</a>
 <a href="https://github.com/binscor" title="Zheng Nai Bin">
   <img src="https://avatars.githubusercontent.com/u/37325821?v=4" width="42;" alt="Zheng Nai Bin">
 </a>
@@ -1029,6 +1029,9 @@
 <a href="https://github.com/swift-fs" title="swift">
   <img src="https://avatars.githubusercontent.com/u/77133741?v=4" width="42;" alt="swift">
 </a>
+<a href="https://github.com/suyangzuo" title="suyangzuo">
+  <img src="https://avatars.githubusercontent.com/u/50766353?v=4" width="42;" alt="suyangzuo">
+</a>
 <a href="https://github.com/Mowmowj" title="nexo">
   <img src="https://avatars.githubusercontent.com/u/24759562?v=4" width="42;" alt="nexo">
 </a>
@@ -1443,7 +1446,7 @@
 <!--rehype:class=home-card home-links-->
 <p>如果你有资源，可以很方便<a href="https://github.com/jaywcjlove/reference/issues/102#issue-1451649637">部署 web 版</a>，这非常简单，只需要克隆 <a href="https://github.com/jaywcjlove/reference/tree/gh-pages">gh-pages</a> 分支代码到你的静态服务就可以了，还可以使用 <a href="https://hub.docker.com/r/wcjiang/reference">docker</a> 快捷部署 web 版。</p>
 
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