Update Ruby changelog for 3.4.0
+3.4.0 (Unreleased)
+===================
+
+Edge:
+ * Fix bug when response is not wrapped with "value"
+
+Firefox:
+ * Support geckodriver v0.16
+
+Ruby:
+ * Support ElementClickIntercepted error from W3C spec
+ * Support ElementNotInteractable error from W3C spec
+
3.3.0 (2017-03-07)
===================
