Update axios dependency due to security vulnerability

[sceee]

This is the same issue as in siddharthkp/bundlesize#369

Do you want to request a feature or report a bug?
Report an outdated, vulnerable dependency.

What is the current behavior?
axios is not updated to a fixed version for the following advisory ( https://www.npmjs.com/advisories/1594 ) as github-build depends on axios ^0.19.0 which prevents npm from updating the dependency to 0.21.1 or higher.

If the current behavior is a bug, please provide the steps to reproduce.
N/A

What is the expected behavior?
axios dependency is updated to >=0.21.1 to depend on a version that fixes the following advisory: https://www.npmjs.com/advisories/1594

If this is a feature request, what is motivation or use case for changing the behavior?
N/A

Please mention other relevant information.
N/A

[abbyblachman]

+1

[emilyyount]

+1

[siddharthkp]

Fixed in #13