Update @types/chrome to the latest version 🚀 (#31)

## The devDependency [@types/chrome](https://github.com/DefinitelyTyped/DefinitelyTyped) was updated from `0.0.79` to `0.0.80`.
This version is **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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package.json

@@ -19,7 +19,7 @@
     "clean": "rm -rf dist"
   },
   "devDependencies": {
-    "@types/chrome": "0.0.79",
+    "@types/chrome": "0.0.80",
     "@types/es6-promise": "3.3.0",
     "@types/gapi.client.calendar": "^3.0.0",
     "babel-core": "^6.26.3",