Extend timeouts to make travis happier (#2055)

diff --git a/test/dartdoc_integration_test.dart b/test/dartdoc_integration_test.dart
index 1007c41..2969caa 100644
--- a/test/dartdoc_integration_test.dart
+++ b/test/dartdoc_integration_test.dart
@@ -248,5 +248,5 @@
       RegExp version = RegExp(r'(\d+\.)?(\d+\.)?(\*|\d+)');
       expect(version.hasMatch(m.group(0)), false);
     });
-  }, timeout: Timeout.factor(4));
+  }, timeout: Timeout.factor(8));
 }