corrects vagrant script path from @b46f343

Vagrantfile

@@ -68,7 +68,7 @@ Vagrant.configure(2) do |config|
   # add a # before ,args: and run 'vagrant up' to get a working
   # non-updated box and then attempt to troubleshoot or open a Github issue 
   
-  config.vm.provision "shell", run: "always", path: "util/avr_setup.sh", args: "-update"
+  config.vm.provision "shell", run: "always", path: "./util/avr_setup.sh", args: "-update"
 
   config.vm.post_up_message = """
   Log into the VM using 'vagrant ssh' on OSX or from Git Bash (Win)