Update gopath explain

en/01.2.md

@@ -4,6 +4,8 @@
 
 Go takes a unique approach to manage the code files with the introduction of a `$GOPATH` directory which contains all the go code in the machine. Note that this is different from the `$GOROOT` environment variable which states where go is installed on the machine. We have to define the $GOPATH variable before using the language, in *nix systems there is a file called `.bashrc` we need to append the below export statement to the file. The concept behind gopath is a novel one, where we can link to any go code at any instant of time without ambiguity.
 
+Starting from go 1.8,The GOPATH environment variable now has a default value if it is unset. It defaults to $HOME/go on Unix and %USERPROFILE%/go on Windows.
+
 In Unix-like systems, the variable should be used like this:
 	
 	export GOPATH=/home/apple/mygo