chore: generate puml (#842)

README.md

@@ -45,6 +45,7 @@ Node.js >= 6.0.0 required.
 - [Website && Documentations](https://eggjs.org)
 - [Plugins](https://github.com/search?q=topic%3Aegg-plugin&type=Repositories)
 - [Frameworks](https://github.com/search?q=topic%3Aegg-framework&type=Repositories)
+- [Plugin Dependency](http://uml.mvnsearch.org/github/eggjs/egg/blob/master/docs/plugins.puml)
 
 > All the documentations (comments, README, etc.) are in English, except the tutorials and api documentations are still [being translated](https://github.com/eggjs/egg/issues/363).
 > Feel free to join us and translate egg documentations. It's appreciated.

README.zh-CN.md

@@ -42,6 +42,7 @@ $ npm install egg --save
 - [官方站点 && 文档](https://eggjs.org/zh-cn/)
 - [插件列表](https://github.com/search?q=topic%3Aegg-plugin&type=Repositories)
 - [框架列表](https://github.com/search?q=topic%3Aegg-framework&type=Repositories)
+- [插件依赖图](http://uml.mvnsearch.org/github/eggjs/egg/blob/master/docs/plugins.puml)
 
 ## 快速开始
 

docs/plugins.puml

@@ -1,17 +1,20 @@
-
 @startuml
-digraph world {
-  "onerror";
-  "session";
-  "i18n";
-  "watcher";
-  "multipart";
-  "security" -> "session";
-  "development" -> "watcher";
-  "logrotator" -> "schedule";
-  "schedule";
-  "static";
-  "jsonp" -> "security";
-  "view";
+digraph plugins {
+  onerror
+  session
+  i18n
+  watcher
+  multipart
+  security
+  development
+  logrotator
+  schedule
+  static
+  jsonp
+  view
+  security -> session
+  development -> watcher
+  logrotator -> schedule
+  jsonp -> security [style=dotted]
 }
 @enduml