updated release notes

RELEASE_NOTES.txt

@@ -7,10 +7,19 @@ Release 2.3.0 (04/15/2019)
   a single list-experiment-files command or API call
 - Added more diagnostic output to compression/decompression utilities
 - DM Station GUI fixes/enhancements:
+  - Added logging and ability to use DM_CONSOLE_LOG_LEVEL environment 
+    variable to specify logging level
+  - Resolved issue with undefined self key in exception hook
   - Added support for single file upload
   - Added support for experiment root path
   - Added warning dialog for experiment updates
   - Added number of tooltips 
+  - Optimized handling of file metadata for experiments with large
+    number of files
+  - Added support for pagination while fetching full list of files
+  - Implemented progress dialog when fetching a very large set of files
+  - Resolved issue with filter boxes layout not matching data table 
+    default column sizes
 
 Release 2.2.2 (02/11/2019)
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