Update readme

README.md

@@ -5,15 +5,15 @@
 
 1. Install n basic nodes (node-1, ..., node-n) running nixos.
 
-``sh
+```sh
 git submodule init
 git submodule update
-``
+```
 
 
 ## Installation
 
-``sh
+```sh
 cd clusters
 cp -r template cluster-1
 cd cluster-1
@@ -23,5 +23,5 @@ for i in node-1 node-2 node-3; do
 done
 vi default.nix # add nodes and ip:s, etc.
 ../../bin/deploy.sh cluster-1
-``
+```