Alphabetize filtering and validation

README.md

 ## Filtering and Validation
 *Libraries for filtering and validating data.*
 
-* [Filterus](https://github.com/ircmaxell/filterus) - A simple PHP filtering library.
-* [Respect Validation](https://github.com/Respect/Validation) - A simple validation library.
-* [Valitron](https://github.com/vlucas/valitron) - Another validation library.
 * [Cake Validation](https://github.com/cakephp/validation) - Another validation library (CP).
-* [Upload](https://github.com/brandonsavage/Upload) - A library for handling file uploads and validation.
 * [DMS Filter](https://github.com/rdohms/DMS-Filter) - An annotation filtering library.
-* [MetaYaml](https://github.com/romaricdrigon/MetaYaml) - A schema validation library that supports YAML, JSON and XML.
+* [Filterus](https://github.com/ircmaxell/filterus) - A simple PHP filtering library.
 * [ISO-codes](https://github.com/ronanguilloux/IsoCodes) - A library for validating various ISO and ZIP codes (IBAN, SWIFT/BIC, BBAN, VAT, SSN, UKNIN).
+* [MetaYaml](https://github.com/romaricdrigon/MetaYaml) - A schema validation library that supports YAML, JSON and XML.
+* [Respect Validation](https://github.com/Respect/Validation) - A simple validation library.
+* [Upload](https://github.com/brandonsavage/Upload) - A library for handling file uploads and validation.
+* [Valitron](https://github.com/vlucas/valitron) - Another validation library.
 * [Volan](https://github.com/serkin/Volan) - Another simplified validation library.
 
 ## API