Update 23_Generics.md

update 2.2 history log
2016-04-09 09:26:42 +08:00
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 > 2.1
 > 校对：[shanks](http://codebuild.me)，2015-11-01

+> 2.2：翻译+校对：[Lanford](https://github.com/LanfordCai)，2016-04-08
+
 本页包含内容：

 - [泛型所解决的问题](#the_problem_that_generics_solve)