Merge #301

301: Update rollup-plugin-typescript2 to the latest version 🚀 r=ForsakenHarmony a=greenkeeper[bot]


## The dependency [rollup-plugin-typescript2](https://github.com/ezolenko/rollup-plugin-typescript2) was updated from `0.18.1` to `0.19.0`.
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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[Find out more about this release](https://github.com/ezolenko/rollup-plugin-typescript2).

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package.json

@@ -69,7 +69,7 @@
     "rollup-plugin-preserve-shebang": "^0.1.6",
     "rollup-plugin-sizes": "^0.4.2",
     "rollup-plugin-terser": "^3.0.0",
-    "rollup-plugin-typescript2": "^0.18.0",
+    "rollup-plugin-typescript2": "^0.19.0",
     "sade": "^1.4.0",
     "tiny-glob": "^0.2.6",
     "tslib": "^1.9.0",