Update Ref

Gemfile.lock

@@ -197,21 +197,23 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.5.0)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.14.1)
     multipart-post (2.1.1)
-    nokogiri (1.10.8)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.11.2)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     octokit (4.15.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (3.1.1)
+    racc (1.5.2)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)

README.md

@@ -1,11 +1,11 @@
 # The Missing Semester of Your CS Education 
 
 Website for the [The Missing Semester of Your CS Education](https://missing.csail.mit.edu/) class!
-[中文站点](https://missing-semester-cn.github.io)
 
+[中文站点](https://missing-semester-cn.github.io)(<span style="float:right"><img src = "https://img.shields.io/badge/最近一次与英文版同步-2021--04--24-green"></span>)
 
-Contributions are most welcome! If you have edits or new content to add, please
-open an issue or submit a pull request.
+
+Contributions are most welcome! If you have edits or new content to add, please open an issue or submit a pull request.
 
 ## Development
 
@@ -27,15 +27,20 @@ To contribute to this tanslation project, please book your topic by creating an
 
 |  lectures   | translator  | status |
 |  ----  | ----  |----  |
-| [course-shell.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/course-shell.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
-| [shell-tools.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/shell-tools.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
-| [editors.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/editors.md)  |  [@stechu](https://github.com/stechu) | Done |
-| [data-wrangling.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/data-wrangling.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
-| [command-line.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/command-line.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
-| [version-control.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/version-control.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
-| [debugging-profiling.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/debugging-profiling.md)  |[@Lingfeng AI](https://github.com/hanxiaomax)  | Done  |
-| [metaprogramming.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/metaprogramming.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
-| [security.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/security.md)  | [@catcarbon](https://github.com/catcarbon) | Done |
-| [potpourri.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/potpourri.md) |  [@catcarbon](https://github.com/catcarbon) | Done |
-| [qa.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/_2020/qa.md) | [@AA1HSHH](https://github.com/AA1HSHH) | Done |
-| [about.md](https://github.com/missing-semester-cn/missing-semester-cn.github.io/blob/master/about.md)  | [@Binlogo](https://github.com/Binlogo)  | Done |
+| [course-shell.md](_2020/course-shell.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
+| [shell-tools.md](_2020/shell-tools.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
+| [editors.md](_2020/editors.md)  |  [@stechu](https://github.com/stechu) | Done |
+| [data-wrangling.md](_2020/data-wrangling.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
+| [command-line.md](_2020/command-line.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
+| [version-control.md](_2020/version-control.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
+| [debugging-profiling.md](_2020/debugging-profiling.md)  |[@Lingfeng AI](https://github.com/hanxiaomax)  | Done  |
+| [metaprogramming.md](_2020/metaprogramming.md)  | [@Lingfeng AI](https://github.com/hanxiaomax) | Done |
+| [security.md](_2020/security.md)  | [@catcarbon](https://github.com/catcarbon) | Done |
+| [potpourri.md](_2020/potpourri.md) |  [@catcarbon](https://github.com/catcarbon) | Done |
+| [qa.md](_2020/qa.md) | [@AA1HSHH](https://github.com/AA1HSHH) | Done |
+| [about.md](about.md)  | [@Binlogo](https://github.com/Binlogo)  | Done |
+
+
+## 新项目
+
+[Learncpp中文版](https://github.com/hanxiaomax/Learncpp_CN)