Collapse successful GET messages together.

lib/src/command/serve.dart

Index: lib/src/command/serve.dart
diff --git a/lib/src/command/serve.dart b/lib/src/command/serve.dart
index e43a9fc2bfa8f6c67b382bf74165e3f3f0d242f6..7462da089c520bf9e916e46547f30feb3db73bbc 100644
--- a/lib/src/command/serve.dart
+++ b/lib/src/command/serve.dart
@@ -158,6 +158,7 @@ class ServeCommand extends BarbackCommand {
       if (result.isSuccess) {
         buffer.write(
             "${log.green('GET')} ${result.url.path} $_arrow ${result.id}");
+        log.collapsible(buffer);
       } else {
         buffer.write("${log.red('GET')} ${result.url.path} $_arrow");
 
@@ -167,9 +168,9 @@ class ServeCommand extends BarbackCommand {
         } else {
           buffer.write(" $error");
         }
-      }
 
-      log.message(buffer);
+        log.error(buffer);
+      }
     }, onError: _fatalError);
 
     log.message("Serving ${entrypoint.root.name} "