Add Provider interface

cmd/stepd/main.go

@@ -76,7 +76,7 @@ func main () {
 	
 	// set up the environment
 	environment := step.Environment { }
-	environment.FuncProviders = providers.All()
+	environment.Providers = providers.All()
 	err = environment.Init(context.Background())
 	if err != nil { log.Fatal(err) }