Sort the valid args before output

We do this so we get stable repeatable output and can see if updates are
necessary or if it is just golang doing the same thing twice differently

bash_completions.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"os"
+	"sort"
 	"strings"
 
 	"github.com/spf13/pflag"
@@ -282,6 +283,7 @@ func writeRequiredFlag(cmd *Command, out *bytes.Buffer) {
 
 func writeRequiredNoun(cmd *Command, out *bytes.Buffer) {
 	fmt.Fprintf(out, "    must_have_one_noun=()\n")
+	sort.Sort(sort.StringSlice(cmd.ValidArgs))
 	for _, value := range cmd.ValidArgs {
 		fmt.Fprintf(out, "    must_have_one_noun+=(%q)\n", value)
 	}