Bump axios from 0.18.1 to 0.21.1 in /src/main/frontend

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](axios/axios@v0.18.1...v0.21.1)

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src/main/frontend/package.json

@@ -3,7 +3,7 @@
     "version": "0.1.0",
     "private": true,
     "dependencies": {
-        "axios": "^0.18.1",
+        "axios": "^0.21.1",
         "bootstrap3": "^3.3.5",
         "react": "^16.4.0",
         "react-bootstrap": "^0.32.1",