Missing semicolon in code example (#24)

diff --git a/README.md b/README.md
index ad3b0c0..d3045a3 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@
 ## Authorization Code Grant
 
 ```dart
-import 'dart:io'
+import 'dart:io';
 import 'package:oauth2/oauth2.dart' as oauth2;
 
 // These URLs are endpoints that are provided by the authorization