May want to update installation instructions

[Matty9191]

You may want to add a note to define (if it isn't already) GOPATH prior to running 'go get ...'. If its not defined you will get an error:

$ go get github.com/mehrdadrad/mylg
package github.com/mehrdadrad/mylg: cannot download, $GOPATH not set. For more details see: go help gopath

Great tool thanks for writing it!