Default config doesn't work

### Expected Behaviour

When I run `aio changelog:generate --config=config.json`, the tool generates a valid Changelog for the latest magento2 code.

### Actual Behaviour

When I run `aio changelog:generate --config=config.json`, the tool fails.

### Reproduce Scenario (including but not limited to)

#### Steps to Reproduce

Run `aio changelog:generate --config=config.json`

#### Platform and Version

macOS 11.4

#### Sample Code that illustrates the problem

#### Logs taken while reproducing problem

```
$ aio changelog:generate --config=config.json
› Warning: @adobe/aio-cli update available from 7.0.0 to 7.1.0.
› Run npm install -g @adobe/aio-cli to update.

==========================
Start changelog generation
==========================
... !
SyntaxError: Unexpected token ' in JSON at position 1331
```

Start by running `aio changelog:generate --config=config.json` on the reported scenario and inspect the JSON parsing failure at position 1331. Compare the supplied configuration with the command's expected input, then verify that generation produces a valid changelog for the latest magento2 code.

Written by the indexing model from the issue text.