Add new release note. (#400)

* Add new release note.

* Update the Graph feature description.

* Update the release log

RELEASE.md

+# RELEASE 1.0.0
+
+## New Features
+
+- Improve the Graph feature to include interactive response. Users can now click on a node to inspect its details such as parameters, input, output, dimensions, etc. They can also zoom in/out and move around if the graph is too large, restore to its original size and download it as PNG.
+- Add new `Audio` recording visualization. Users can recording audio and inspect to help fine tuning the audio training.
+- Add new `Text` recording visualization. Users can record strings during training and inspect later.
+- User can manually `save` to sync the recordings to the disk.
+
+## Bug Fixes and improvements
+
+- Fix Scalar incorrect wall time display
+- Fix incorrect timestamp label display
+- Fix the Travis-CI not failing issue
+- Fix the last recording not showing
+- Update and clarify ImageWriter API docs for input params.
+- VisualDL will call `SyncToDisk` before exiting.
+- Adjust the interval between each `SyncToDisk` to improve performance.
+- Enforce ESLint coding standard.