Bump axios from 0.18.1 to 0.21.1 (#979)

Bumps [axios](https://github.com/axios/axios) from 0.18.1 to 0.21.1.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v0.21.1/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v0.18.1...v0.21.1)

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package.json

@@ -13,7 +13,7 @@
     "@turf/center": "^6.0.1",
     "acorn": "^7.4.1",
     "animate.css": "~3.6",
-    "axios": "^0.18.1",
+    "axios": "^0.21.1",
     "bootstrap": "~4.3",
     "bootstrap-sass": "^3.4.1",
     "bootstrap3": "npm:bootstrap@~3.4",