Update 2019 conferences list (#1898)

* Update 2019 conferences list 

Add React Advanced, React Day Berlin 2019. Sort passed conferences.

* add missing year to React Advanced 2019

content/community/conferences.md

@@ -12,26 +12,16 @@ Do you know of a local React.js conference? Add it here! (Please keep the list c
 
 ## Upcoming Conferences {#upcoming-conferences}
 
-### Reactathon 2019 {#reactathon-2019}
-March 30-31, 2019 in San Francisco, USA
-
-[Website](https://www.reactathon.com/) - [Twitter](https://twitter.com/reactathon)
-
-### App.js Conf 2019 {#appjs-conf-2019}
-April 4-5, 2019 in Kraków, Poland
-
-[Website](https://appjs.co) - [Twitter](https://twitter.com/appjsconf)
-
-### React Amsterdam 2019 {#react-amsterdam-2019}
-April 12, 2019 in Amsterdam, The Netherlands
-
-[Website](https://react.amsterdam) - [Twitter](https://twitter.com/reactamsterdam) - [Facebook](https://www.facebook.com/reactamsterdam)
-
 ### ReactJS Girls Conference
 May 3, 2019 in London, UK
 
 [Website](https://reactjsgirls.com/) - [Twitter](https://twitter.com/reactjsgirls)
 
+### <React.NotAConf /> 2019 {#reactnotaconf--2019}
+May 11 in Sofia, Bulgaria
+
+[Website](http://react-not-a-conf.com/) - [Twitter](https://twitter.com/reactnotaconf) - [Facebook](https://www.facebook.com/events/780891358936156)
+
 ### ReactEurope 2019 {#reacteurope-2019}
 May 23-24, 2019 in Paris, France
 
@@ -87,6 +77,16 @@ September 26-28, 2019 in Alicante, Spain
 
 [Website](http://reactalicante.es/) - [Twitter](https://twitter.com/reactalicante) - [Facebook](https://www.facebook.com/ReactAlicante)
 
+### React Advanced 2019 {#react-advanced-2019}
+October 25, 2019 in London, UK
+
+[Website](https://reactadvanced.com) - [Twitter](http://twitter.com/reactadvanced) - [Facebook](https://www.facebook.com/ReactAdvanced) - [Videos](https://youtube.com/c/ReactConferences)
+
+### React Day Berlin 2019 {#react-day-berlin-2019}
+December 6, 2019 in Berlin, Germany
+
+[Website](https://reactday.berlin) - [Twitter](https://twitter.com/reactdayberlin) - [Facebook](https://www.facebook.com/reactdayberlin/) - [Videos](https://www.youtube.com/reactdayberlin)
+
 ## Past Conferences {#past-conferences}
 
 ### React.js Conf 2015 {#reactjs-conf-2015}
@@ -114,7 +114,7 @@ February 22 & 23 in San Francisco, CA
 ### React Amsterdam 2016 {#react-amsterdam-2016}
 April 16 in Amsterdam, The Netherlands
 
-[Website](https://react.amsterdam/2016) - [Videos](https://youtu.be/sXDZBxbRRag?list=PLNBNS7NRGKMG3uLrm5fgY02hJ87Wzb4IU)
+[Website](https://react.amsterdam) - [Twitter](https://twitter.com/reactamsterdam) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
 
 ### ReactEurope 2016 {#reacteurope-2016}
 June 2 & 3 in Paris, France
@@ -164,7 +164,7 @@ March 28th at the [QEII Centre, London](http://qeiicentre.london/)
 ### React Amsterdam 2017 {#react-amsterdam-2017}
 April 21st in Amsterdam, The Netherlands
 
-[Website](https://react.amsterdam) - [Twitter](https://twitter.com/reactamsterdam) - [Videos](https://www.youtube.com/watch?v=NQyL-Dm7Kig&list=PLNBNS7NRGKMHxfm0CcYNuINLdRw7r4a9M)
+[Website](https://react.amsterdam) - [Twitter](https://twitter.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
 
 ### ReactEurope 2017 {#reacteurope-2017}
 May 18th & 19th in Paris, France
@@ -361,7 +361,17 @@ January 31, 2019 in Tehran, Iran
 
 [Website](http://reactiran.com) - [Instagram](https://www.instagram.com/reactiran/)
 
-### <React.NotAConf /> 2019 {#reactnotaconf--2019}
-May 11 in Sofia, Bulgaria
+### Reactathon 2019 {#reactathon-2019}
+March 30-31, 2019 in San Francisco, USA
 
-[Website](http://react-not-a-conf.com/) - [Twitter](https://twitter.com/reactnotaconf) - [Facebook](https://www.facebook.com/events/780891358936156)
+[Website](https://www.reactathon.com/) - [Twitter](https://twitter.com/reactathon)
+
+### App.js Conf 2019 {#appjs-conf-2019}
+April 4-5, 2019 in Kraków, Poland
+
+[Website](https://appjs.co) - [Twitter](https://twitter.com/appjsconf)
+
+### React Amsterdam 2019 {#react-amsterdam-2019}
+April 12, 2019 in Amsterdam, The Netherlands
+
+[Website](https://react.amsterdam) - [Twitter](https://twitter.com/reactamsterdam) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)