add myself to credits (I'm the translator) (#243)

README.md

@@ -111,6 +111,7 @@ Huge thanks to these people, we couldn't have completed this project without the
 - Nightwind: [https://twitter.com/NightwindDev](https://twitter.com/NightwindDev)
 - Nick Chan: [https://nickchan.lol](https://nickchan.lol)
 - nzhaonan: [https://twitter.com/nzhaonan](https://twitter.com/nzhaonan)
+- Oliver Tzeng: [https://github.com/olivertzeng](https://github.com/olivertzeng)
 - omrkujman: [https://twitter.com/omrkujman](https://twitter.com/omrkujman)
 - opa334: [http://github.com/opa334](http://github.com/opa334)
 - onejailbreak: [https://twitter.com/onejailbreak_](https://twitter.com/onejailbreak_)