Bump eventsource from 1.0.5 to 2.0.2

Bumps [eventsource](https://github.com/EventSource/eventsource) from 1.0.5 to 2.0.2.
- [Release notes](https://github.com/EventSource/eventsource/releases)
- [Changelog](https://github.com/EventSource/eventsource/blob/master/HISTORY.md)
- [Commits](EventSource/eventsource@v1.0.5...v2.0.2)

---
updated-dependencies:
- dependency-name: eventsource
  dependency-type: direct:development
...

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

package.json

@@ -38,7 +38,7 @@
   },
   "devDependencies": {
     "coveralls": "^3.0.4",
-    "eventsource": "^1.0.5",
+    "eventsource": "^2.0.2",
     "istanbul": "^0.4.5",
     "jasmine": "^3.1.0",
     "request": "^2.88.0"