Since Go is intent on a Go value being in go.mod

We're going to set it to 1.10 for now.

go.mod

@@ -5,4 +5,4 @@ require (
 	golang.org/x/crypto v0.0.0-20181030102418-4d3f4d9ffa16
 )
 
-go 1.13
+go 1.10