Default rate limit message

example/rate_limit.dart

@@ -1,10 +1,15 @@
 import 'package:angel_framework/angel_framework.dart';
 import 'package:angel_framework/http.dart';
 import 'package:angel_security/angel_security.dart';
+import 'package:logging/logging.dart';
+import 'package:pretty_logging/pretty_logging.dart';
 
 main() async {
+  // Logging boilerplate.
+  Logger.root.onRecord.listen(prettyLog);
+
   // Create an app, and HTTP driver.
-  var app = Angel(), http = AngelHttp(app);
+  var app = Angel(logger: Logger('rate_limit')), http = AngelHttp(app);
 
   // Create a simple in-memory rate limiter that limits users to 5
   // queries per hour.

lib/src/rate_limiter.dart

@@ -26,7 +26,7 @@ abstract class RateLimiter<User> {
   final String errorMessage;
 
   RateLimiter(this.maxPointsPerWindow, this.windowDuration,
-      {this.errorMessage});
+      {this.errorMessage = 'Rate limit exceeded.'});
 
   /// Computes the current window in which the user is acting.
   ///

pubspec.yaml

@@ -12,4 +12,5 @@ dev_dependencies:
   angel_test: ^2.0.0
   angel_validate: ^2.0.0
   pedantic: ^1.0.0
+  pretty_logging: ^1.0.0
   test: ^1.0.0