Merge branch 'update-readme' into 'master'

Update readme

See merge request cocsn/gosdn!144

README.md

@@ -41,6 +41,7 @@ Any device directly configured by `goSDN`
 You can install the latest release of `goSDN` locally using the `go get` command. Since the repository and some dependencies are not publicly available you have to modify your git config first:
 ```sh
 > git config --global url."git@code.fbi.h-da.de:".insteadOf "https://code.fbi.h-da.de"
+> go env -w GOPRIVATE=code.fbi.h-da.de/cocsn/*
 > go get code.fbi.h-da.de/cocsn/gosdn/cmd/gosdn
 ```
 
@@ -48,6 +49,7 @@ To install the development version you need to clone the repo and use `go instal
 ```sh
 # If you haven't cloned the repo yet
 > git config --global url."git@code.fbi.h-da.de:".insteadOf "https://code.fbi.h-da.de"
+> go env -w GOPRIVATE=code.fbi.h-da.de/cocsn/*
 > cd $GOPATH/src
 > git clone git@code.fbi.h-da.de:cocsn/gosdn.git