Go-MySQL-Driver is now at GitHub

Moreover `keepalive` is now deprecated, since closed connections can now be handled automatically (even more comfortable ;) ).
So please also change line 15. 

Update 2.5.md 

修正部分单词错误和汉字错误，重新修正语句描述

修正一些单词错误,减少语句罗嗦之处

Update 2.7.md

这里能在多解释解释runtime.Gosched()就好了，这一章感觉写的东西不够细啊。

修改单词拼写错误

修改错别字

review three file for 13 chapter ,updated some word

Update 9.1.md

这里应该有逗号

描述有错误

Update 2.2.md

aSlice = array[5:] // 等价于aSlice = array[5:10] aSlice包含元素: f,g,h,i,j

语句通顺

修改错别字