Update axios to support PROXY env vars

[ricovitch]

• I'm submitting a ...
  [ ] bug report
  [X] feature request
  [ ] question about the decisions made in the repository
  [ ] question about how to use this project

• Summary

Please update the axios dependency to support usage of HTTP_PROXY and HTTPS_PROXY environment variables.

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. StackOverflow, personal fork, etc.)

Related issue on @figma-export/cli : marcomontalbano/figma-export#152

[ricovitch]

Merging this PR could also solve this issue : #61