Auto merge of #3563 - mikerite:readme-syspath, r=phansch
Auto merge of #3563 - mikerite:readme-syspath, r=phansch

Update README local run command to specify syspath

graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust