Unable to access behind proxy

When I run `gren changelog -B` on a public repo, I do get the following:
```
Options:
Tags: empty
Prefix: empty
Template: [object Object]
Prerelease: false
Generate: false
Quiet: false
Override: false
Debug: true
Ignore labels: empty
Ignore issues with: empty
Ignore commits with: empty
Group by: false
Milestone match: Release {{tag_name}}
Changelog filename: CHANGELOG.md
Username: NCI-Agency
Repo: anet
Token: ********************************'
Data source: issues
Include messages: commits
Ignore tags with: empty
Limit: 30

🤖 - Generate changelog file:
===================================
WARNING: Looks like you don't have network connectivity!
⠋ Getting the list of releasesTypeError: Cannot read property 'status' of undefined
at handler (/usr/lib/node_modules/github-release-notes/node_modules/github-api/dist/components/Requestable.js:366:40)
at
⠋ Getting the list of releases
```

At the same time, directly calling the api works:
```
curl -X GET \
https://api.github.com/repos/NCI-Agency/anet/releases \
-H 'accept: application/json' \
-H 'authorization: token ********************************' \
-H 'content-type: application/json'
```

I am behind a proxy. Any help would be appreciated!

Comienza con la ruta `gren changelog -B`, que solicita el endpoint de releases de GitHub; después, inspecciona el fallo indicado en `node_modules/github-release-notes/node_modules/github-api/dist/components/Requestable.js` y compáralo con la solicitud curl que funciona. Se considera terminado cuando el comando pueda recuperar releases mediante la configuración de proxy indicada sin la advertencia de red ni el TypeError de `status`.

Escrito por el modelo de indexación a partir del texto del issue.