Add React Amsterdam 2017 (#8235)

We've recently announced the dates for our next React Amsterdam edition, looking forward on adding it to the list.

Author: robhrt7

docs/community/conferences.md

@@ -19,6 +19,11 @@ May 18th & 19th in Paris, France
 
 [Website](http://www.react-europe.org/) - [Schedule](http://www.react-europe.org/#schedule)
 
+### React Amsterdam 2017
+April 21st in Amsterdam, The Netherlands
+
+[Website](https://react.amsterdam) - [Twitter](https://twitter.com/reactamsterdam)
+
 ### Chain React 2017
 Summer 2017, Portland, Oregon USA
 
@@ -57,7 +62,7 @@ February 22 & 23 in San Francisco, CA
 ### React Amsterdam 2016
 April 16 in Amsterdam, The Netherlands
 
-[Website](http://react.amsterdam) - [Videos](https://youtu.be/sXDZBxbRRag?list=PLNBNS7NRGKMG3uLrm5fgY02hJ87Wzb4IU)
+[Website](https://react.amsterdam/2016) - [Videos](https://youtu.be/sXDZBxbRRag?list=PLNBNS7NRGKMG3uLrm5fgY02hJ87Wzb4IU)
 
 ### ReactEurope 2016
 June 2 & 3 in Paris, France