Update CHANGELOG.md

CHANGELOG.md

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 Roundcube Webmail RemoveAttachments
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+**2016-09-26**
+- Mark the created message as seen.
+- CS fixes.
+
+**2016-06-03**
+- Add version to composer.json (#4).
+
+**2016-05-02**
+- Add spanish translation.
+
+**2016-04-01**
+- Add czech translation by <a href="https://github.com/petr-hendl">@petr-hendl</a>.
+
+**2016-03-28**
+- Rename project (minor change).
+
 **2016-02-19**
-- Merge PR to add russian localization file (by <a href="https://github.com/vitlav">vitlav</a>).
+- Merge PR to add russian localization file by <a href="https://github.com/vitlav">@vitlav</a>.
 - Remove deprecated call to get_input_value(); fix code indentation.
 
 **2015-05-20**