Bump version to publish 1.2.0. (#742)

(Also fix a tiny missing await.)

bin/format.dart

@@ -15,7 +15,7 @@ import 'package:dart_style/src/source_code.dart';
 import 'package:dart_style/src/style_fix.dart';
 
 // Note: The following line of code is modified by tool/grind.dart.
-const version = "1.1.3";
+const version = "1.2.0";
 
 void main(List<String> args) {
   var parser = new ArgParser(allowTrailingOptions: true);

pubspec.yaml

@@ -1,6 +1,6 @@
 name: dart_style
 # Note: See tool/grind.dart for how to bump the version.
-version: 1.2.0-dev
+version: 1.2.0
 author: Dart Team <misc@dartlang.org>
 description: Opinionated, automatic Dart source code formatter.
 homepage: https://github.com/dart-lang/dart_style

test/command_line_test.dart

@@ -316,7 +316,7 @@ void main() {
           "Could not format because the source could not be parsed:");
       expect(await process.stderr.next, "");
       expect(await process.stderr.next, contains("some/path.dart"));
-      process.stderr.cancel();
+      await process.stderr.cancel();
       await process.shouldExit(65);
     });
   });