build(deps): update @data-ui/event-flow requirement (#129)

Updates the requirements on [@data-ui/event-flow](https://github.com/williaster/data-ui) to permit the latest version.
- [Release notes](https://github.com/williaster/data-ui/releases)
- [Changelog](https://github.com/williaster/data-ui/blob/master/CHANGELOG.md)
- [Commits](williaster/data-ui@v0.0.78...v0.0.79)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-legacy-plugin-chart-event-flow/package.json

@@ -28,7 +28,7 @@
     "access": "public"
   },
   "dependencies": {
-    "@data-ui/event-flow": "^0.0.78",
+    "@data-ui/event-flow": "^0.0.79",
     "prop-types": "^15.6.2"
   },
   "peerDependencies": {

superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-plugins-demo/package.json

@@ -30,7 +30,7 @@
   "homepage": "https://github.com/apache-superset/superset-ui-plugins#readme",
   "dependencies": {
     "@babel/polyfill": "^7.4.3",
-    "@data-ui/event-flow": "^0.0.78",
+    "@data-ui/event-flow": "^0.0.79",
     "@storybook/addon-actions": "^5.0.9",
     "@storybook/addon-knobs": "^5.0.9",
     "@storybook/addon-links": "^5.0.9",