Updating Java changelog for 3.8

Author: barancev

java/CHANGELOG

@@ -1,7 +1,17 @@
 v3.8.0
 ======
 
-* Added support for managing Grid Hubs and Nodes via JMX
+* Node skips configurations that does not match current platform, no more IE
+  slots on Linux-based nodes.
+* Introduced unique ids for node slot configurations. Hub injects UID of the
+  matched configuration to the new request payload. Node mutates capabilities
+  with matching config UUID only. This allows to have multiple configurations
+  for the same browser in node config file.
+* Implemented matching of some browser-specific capabilities on Grid hub,
+  namely "marionette" for Firefox (default is true) and "technologyPreview"
+  for Safari (default is false).
+* "technologyPreview" capability is now honored again by SafariDriver.
+* Added initial support for managing Grid Hubs and Nodes via JMX
 * Removed `Alert.authenticate` and supporting classes
 * Better handling of configuring SafariDriver via capabilities.