Make the successfully configured message friendlier

The configure output looked like it could be an error message.
This adds a bit of context to say that the configuration was saved, and
clarifies the output to make it easier to understand that it's showing you
what the configuration settings that were saved are.

cmd/configure.go

@@ -197,6 +197,7 @@ func runConfigure(configuration config.Configuration, flags *pflag.FlagSet) erro
 	if err := configuration.Save("user"); err != nil {
 		return err
 	}
+	fmt.Fprintln(Err, "\nYou have configured the Exercism command-line client:")
 	printCurrentConfig(configuration)
 	return nil
 }
@@ -208,10 +209,10 @@ func printCurrentConfig(configuration config.Configuration) {
 	v := configuration.UserViperConfig
 
 	fmt.Fprintln(w, "")
-	fmt.Fprintln(w, fmt.Sprintf("Config dir:\t%s", configuration.Dir))
-	fmt.Fprintln(w, fmt.Sprintf("-t, --token\t%s", v.GetString("token")))
-	fmt.Fprintln(w, fmt.Sprintf("-w, --workspace\t%s", v.GetString("workspace")))
-	fmt.Fprintln(w, fmt.Sprintf("-a, --api\t%s", v.GetString("apibaseurl")))
+	fmt.Fprintln(w, fmt.Sprintf("Config dir:\t\t%s", configuration.Dir))
+	fmt.Fprintln(w, fmt.Sprintf("Token:\t(-t, --token)\t%s", v.GetString("token")))
+	fmt.Fprintln(w, fmt.Sprintf("Workspace:\t(-w, --workspace)\t%s", v.GetString("workspace")))
+	fmt.Fprintln(w, fmt.Sprintf("API Base URL:\t(-a, --api)\t%s", v.GetString("apibaseurl")))
 	fmt.Fprintln(w, "")
 }