Update README.md

Author: pazams

README.md

@@ -13,8 +13,8 @@ Chinese translated version can be found at https://github.com/chenjinya/go-for-j
 
 ## License
 
-Copyright Maor Zamski & Daniel Singer
+Copyright Maor Zamski & Daniel Singer.
 
 "Go for Javascript Developers" is released under the [Creative Commons Attribution-ShareAlike 4.0 International License.](http://creativecommons.org/licenses/by-sa/4.0/).
 
-The "gopher" used at the cover was [created](https://github.com/golang-samples/gopher-vector) by [Takuya Ueda](https://twitter.com/tenntenn). It is licensed under the [Creative Commons 3.0 Attributions license](https://creativecommons.org/licenses/by/3.0/deed).
+Cover design by [Stefano Tirloni](https://www.stedesign.com/).