Add Vue.js Amsterdam event data (#16)

Source: https://www.vuejs.amsterdam

Author: gustojs

README.md

@@ -123,3 +123,9 @@ We plan to invest time in developing a more robust regression testing system to
 * Planned date: Nov 3. 2018
 * Location: Tokyo, Japan
 * [Website](https://vuefes.jp)
+
+### Vue.js Amsterdam 2019
+
+* Planned date: Feb 14-15. 2019
+* Location: Amsterdam, Netherlands
+* [Website](https://www.vuejs.amsterdam)