Updated SettingGOPATH (markdown)
diff --git a/SettingGOPATH.md b/SettingGOPATH.md
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+- [Unix systems](#unix-systems)
+  * [Bash](#bash)
+  * [Zsh](#zsh)
+- [Windows](#windows)
+
 # Unix systems
 
 `GOPATH` can be any directory on your system. In Unix examples, we will set it to `$HOME/work`. Note that `GOPATH` must not be the same path as your Go installation. Another common setup is to set GOPATH=$HOME.