Add conference: ReactiveConf 2017

Author: dmytroyarmak

README.md

@@ -81,6 +81,7 @@ List of useful resources for frontend developers
 
 ## Conferences
 - [JS Kongress 2017](https://www.youtube.com/playlist?list=PL8ajgHZ7PoCt3l5RXoyqVu_r7gYJU0dMx) (November 13 - 14, 2017)
+- [ReactiveConf 2017](https://www.youtube.com/playlist?list=PLa2ZZ09WYepMB-I7AiDjDYR8TjO8uoNjs) (October 25 - 27, 2017)
 - [RuhrJS 2017](https://www.youtube.com/playlist?list=PLZQv2lZnFSKd2LMYCckOMp3YGmKPrm3Xi) (October 14 - 15, 2017)
 - [AngularMix 2017](https://www.youtube.com/playlist?list=PLgRm9JfK2F3qeHLHtrIVqNef0LT04UD05) (October 10 - 12, 2017)
 - [ReactNext 2017](https://www.youtube.com/channel/UC3BT8hh3yTTYxbLQy_wbk2w/videos) (September 10, 2017)