Describe the bug
When using an access token via ENV variable 'CHANGELOG_GITHUB_TOKEN' and then generating a changelog with:

• github_changelog_generator -p myproject -u myproject-at-some-github-repo

The output log shows that a token was not used even though it is was
(this log output is truncated for readability):

:user=>"myusername"
:project=>"myproject-at-some-github-repo"
:token=>"No token used"

To Reproduce
Steps to reproduce the behavior:

1. Setup an access token using the env variable 'CHANGELOG_GITHUB_TOKEN'
2. Generate a changelog without using the --token option
3. Pay attention to the log output

The log output contains:
:token=>"No token used"

Expected behavior
The token used should be in the output log or at least with a message like:
:token=>"Token in use"

Desktop (please complete the following information):

• OS: Focal
• Browser: Chome
• Version: 1.16.1