If available only list feat and fixes

If the most repo commit messages follow style, like this https://www.npmjs.com/package/validate-commit-msg

```
simple-bin-help 1.2.0 -> 1.3.0
Changelog for module simple-bin-help repo bahmutov/simple-bin-help from 1.2.0 to 1.3.0

1.3.0
cfa6235: fix(es6): allow const keywords under Node 0.12
79b031c: feat(help): Showing help message on -h or --help
92d9936: feat(update): Calling updater-notifier automatically if there is package information
f6ef63d: feat(callback): Added onFail callback to be called if fails to check arguments
1c6a1b2: test(ci): running lint on ci before unit tests
c666683: style(standard): Trying standard javascript
```

then filter and print just `feat` and `fix`

Start by tracing the changed-log entry point that formats commit messages between two NPM versions. Use the example in the issue to identify conventional-commit types, and consider the work complete when the output includes only feat and fix commits while preserving the existing version range behavior.

Written by the indexing model from the issue text.