Bump jszip from 3.4.0 to 3.7.0 (#102)

Bumps [jszip](https://github.com/Stuk/jszip) from 3.4.0 to 3.7.0.
- [Release notes](https://github.com/Stuk/jszip/releases)
- [Changelog](https://github.com/Stuk/jszip/blob/master/CHANGES.md)
- [Commits](Stuk/jszip@v3.4.0...v3.7.0)

---
updated-dependencies:
- dependency-name: jszip
  dependency-type: direct:production
...

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package.json

@@ -58,7 +58,7 @@
     "fuse.js": "3.6.1",
     "js-cookie": "2.2.1",
     "jsonlint": "1.6.3",
-    "jszip": "3.4.0",
+    "jszip": "3.7.0",
     "lodash": "^4.17.17",
     "normalize.css": "7.0.0",
     "nprogress": "0.2.0",