Update conferences.md (#2445)

Added reactsummit from nigeria

Author: adebayoileri

content/community/conferences.md

@@ -12,6 +12,11 @@ Do you know of a local React.js conference? Add it here! (Please keep the list c
 
 ## Upcoming Conferences {#upcoming-conferences}
 
+### React Summit 2019 {#reactsummit2019}
+November 30, 2019 in Lagos, Nigeria
+
+[Website](https://reactsummit2019.splashthat.com) -[Twitter](https://twitter.com/react_summit)
+
 ### React Conf 2019 {#react-conf-2019}
 October 24-25, 2019 in Henderson, Nevada USA