Minor formatting fixes

CONTRIBUTING.md

@@ -23,7 +23,7 @@ All submissions, including submissions by project members, require review.
 ### File headers
 All files in the project must start with the following header.
 
-    // Copyright 2018 Google LLC
+    // Copyright 2019 Google LLC
     //
     // Use of this source code is governed by an MIT-style
     // license that can be found in the LICENSE file or at

lib/runner.dart

@@ -13,7 +13,7 @@ import 'src/migrators/module.dart';
 
 /// A command runner that runs a migrator based on provided arguments.
 class MigratorRunner extends CommandRunner<p.PathMap<String>> {
-  final invocation = "sass_migrator <migrator> [options] <entrypoint.scss ...>";
+  final invocation = "sass_migrator <migrator> [options] <entrypoint.scss...>";
 
   MigratorRunner()
       : super("sass_migrator", "Migrates stylesheets to new Sass versions.") {

lib/src/migrator.dart

@@ -7,6 +7,7 @@
 import 'dart:io';
 
 import 'package:args/command_runner.dart';
+import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 
 import 'utils.dart';
@@ -39,6 +40,7 @@ abstract class Migrator extends Command<p.PathMap<String>> {
   ///
   /// Files that did not require any changes, even if touched by the migrator,
   /// should not be included map of results.
+  @protected
   void migrateFile(String entrypoint);
 
   /// Runs this migrator.

lib/src/migrators/module.dart

@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2019 Google LLC
 //
 // Use of this source code is governed by an MIT-style
 // license that can be found in the LICENSE file or at

lib/src/migrators/module/built_in_functions.dart

@@ -1,3 +1,9 @@
+// Copyright 2019 Google LLC
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
 /// Mapping from existing built-in function name to the module it's now part of.
 const builtInFunctionModules = {
   "red": "color",

lib/src/patch.dart

@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2019 Google LLC
 //
 // Use of this source code is governed by an MIT-style
 // license that can be found in the LICENSE file or at

test/patch_test.dart

@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2019 Google LLC
 //
 // Use of this source code is governed by an MIT-style
 // license that can be found in the LICENSE file or at