missing semicolon in readme usage

Author: pscheit

README.md

@@ -26,7 +26,7 @@ To add this package as a local, per-project dependency to your project, simply a
 ### Usage
 
 ```php
-use SebastianBergmann\Diff
+use SebastianBergmann\Diff;
 
 $diff = new Diff("--- expected\n+++ actual\n");
 $diff->diff($expected, $actual);