Update dependency danger to v3.7.19 (#209)

This Pull Request updates dependency [danger](https://github.com/danger/danger-js) from `v3.7.18` to `v3.7.19`



<details>
<summary>Release Notes</summary>

### [`v3.7.19`](https://github.com/danger/danger-js/blob/master/CHANGELOG.md#&#8203;3719)
[Compare Source](danger/danger-js@3.7.18...3.7.19)
* Convert the `exec` in `danger local` to a `spawn` hopefully unblocking large diffs from going through it -
  [@&#8203;joshacheson][] [@&#8203;orta][]

---

</details>




---

This PR has been generated by [Renovate Bot](https://renovatebot.com).

package.json

@@ -18,7 +18,7 @@
     "autoprefixer": "8.6.4",
     "connect-history-api-fallback": "1.5.0",
     "cross-env": "5.2.0",
-    "danger": "3.7.18",
+    "danger": "3.7.19",
     "eslint": "5.0.1",
     "eslint-formatter-pretty": "1.3.0",
     "eslint-import-resolver-typescript": "1.0.2",

yarn.lock

@@ -1909,9 +1909,9 @@ damerau-levenshtein@^1.0.0:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/damerau-levenshtein/-/damerau-levenshtein-1.0.4.tgz#03191c432cb6eea168bb77f3a55ffdccb8978514"
 
-[email protected].18:
-  version "3.7.18"
-  resolved "https://registry.yarnpkg.com/danger/-/danger-3.7.18.tgz#944e0e2786b3f40c044345f8185c0e2e61131cdc"
+[email protected].19:
+  version "3.7.19"
+  resolved "https://registry.yarnpkg.com/danger/-/danger-3.7.19.tgz#916f5ac14df9335c80c19d2dfe402a062e755a31"
   dependencies:
     "@octokit/rest" "^15.5.0"
     babel-polyfill "^6.23.0"