Update CHANGELOG.md

CHANGELOG.md

@@ -2,10 +2,11 @@ Pico Changelog
 ==============
 
 ### Version 1.0.3
-Released: -
+Released: 2016-05-11
 
 ```
 * [Changed] Improve documentation
+* [Changed] Heavily extend nginx configuration docs
 * [Changed] Add CSS rules for definition lists to default theme
 * [Changed] Always use `on404Content...` execution path when serving a `404.md`
 * [Changed] Deny access to `.git` directory, `CHANGELOG.md`, `composer.json`