Bump axios from 0.15.2 to 0.21.1

Bumps [axios](https://github.com/axios/axios) from 0.15.2 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@v0.15.2...v0.21.1)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "alertifyjs": "1.11.0",
     "auto-bind": "1.1.0",
-    "axios": "0.15.2",
+    "axios": "0.21.1",
     "bcrypt": "^5.0.1",
     "bluebird": "3.5.0",
     "body-parser": "1.15.2",