Fixe name of timezone in example output

hollodotme · hollodotme · commit 4368601d166e · 2018-05-21T22:30:30.000+02:00
diff --git a/README.md b/README.md
@@ -129,7 +129,7 @@ If you're not using PSR-4 autoloading, also add the class' file path to the `<li
 
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-Report created at 2018-05-21 22:23:12 (Europe/Berlin)
+Report created at 2018-05-21 22:23:12 (UTC)
 
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