Update version number in help.
diff --git a/lib/src/cli/formatter_options.dart b/lib/src/cli/formatter_options.dart
index 75c67db..919307c 100644
--- a/lib/src/cli/formatter_options.dart
+++ b/lib/src/cli/formatter_options.dart
@@ -13,7 +13,7 @@
import 'summary.dart';
// Note: The following line of code is modified by tool/grind.dart.
-const dartStyleVersion = '1.3.9';
+const dartStyleVersion = '1.3.10';
/// Global options that affect how the formatter produces and uses its outputs.
class FormatterOptions {
