Fix bug with mv

README.md

@@ -23,6 +23,13 @@ Dockerfile.in:
    - change the `MAINTAINER` to you
    - maybe change or remove the `USER` if you need
 
+## Go Modules
+
+This assumes the use of go modules (which will be the default for all Go builds
+as of Go 1.13) and vendoring (which reasonable minds might disagree about).  You
+will need to run `go mod init` to set them up, and you will need to run `go mod
+vendor` to create a `vendor` directory when you have dependencies.
+
 ## Building
 
 Run `make` or `make build` to compile your app.  This will use a Docker image