Bump to release 1.0.10. (#674)

diff --git a/pubspec.yaml b/pubspec.yaml
index 87fd96c..e89d909 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: dart_style
 # Note: See tool/grind.dart for how to bump the version.
-version: 1.0.10-dev
+version: 1.0.10
 author: Dart Team <misc@dartlang.org>
 description: Opinionated, automatic Dart source code formatter.
 homepage: https://github.com/dart-lang/dart_style