Rename exit_code file to match class name (#11)
diff --git a/lib/io.dart b/lib/io.dart
index 3af40ae..4e42aa9 100644
--- a/lib/io.dart
+++ b/lib/io.dart
@@ -2,7 +2,7 @@
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
-export 'src/exit_codes.dart' show ExitCode;
+export 'src/exit_code.dart' show ExitCode;
export 'src/permissions.dart' show isExecutable;
export 'src/process_manager.dart' show ProcessManager, Spawn;
export 'src/shared_stdin.dart' show SharedStdIn, sharedStdIn;
diff --git a/lib/src/exit_codes.dart b/lib/src/exit_code.dart
similarity index 100%
rename from lib/src/exit_codes.dart
rename to lib/src/exit_code.dart
