docs(events): add nodeukraine (#2130)

Author: lirantal

locale/en/get-involved/node-events.md

@@ -22,3 +22,4 @@ FORMAT
 | [NodeConf Colombia](https://colombia.nodeconf.com) |   Medellin, Columbia    |   June 21-22   |
 |  [NodeConf EU](https://www.nodeconf.eu/2019.html)  | Lyrath Estate, Kilkenny | November 10-13 |
 |      [NodeSummit](https://www.nodesummit.com)      |      San Francisco      |      TBA       |
+|      [NodeUkraine](https://nodeukraine.org.ua)     |      Kyiv, Ukraine      |     May 18     |