Add release notes for the next release

Author: jpsacha

notes/0.3.1.md

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+### ScalaFX-Extras Release v.0.3.1
+
+Main objective of this release is to add support for Scala 2.13
+
+Changes:
+
+* [Issue #3][3] Do not catch Throwable
+* [Issue #4][4] Do not catch Throwable
+
+
+To post questions please use [ScalaFX Users Group][scalafx-users] of [StackOverflow ScalaFX][scalafx-overflow]  
+
+[scalafx-users]: https://groups.google.com/forum/#!forum/scalafx-users
+[scalafx-overflow]: https://stackoverflow.com/questions/tagged/scalafx
+
+[3]: https://github.com/scalafx/scalafx-extras/issues/3
+[4]: https://github.com/scalafx/scalafx-extras/issues/4
+