Update Ruby changelog for 3.6.0
+3.6.0 (2017-09-22)
+==================
+
+Edge:
+ * Fixed a bug when execute_script failed using server + Edge (issue #4651)
+
+Firefox:
+ * Fixed a bug when web extension failed to install using profile class (issue #4093)
+
+PhantomJS:
+ * Support is deprecated in favor of headless Chrome/Firefox
+
3.5.2 (2017-09-07)
==================
