<!-- ISSUES NOT FOLLOWING THIS TEMPLATE WILL BE CLOSED AND DELETED -->

<!-- Check all that apply [x] -->

## Check list

- [ ] I have read through the [README](https://github.com/wfxr/csview/blob/master/README.md)
- [ ] I have searched through the existing issues

## Environment info

- OS
    - [ ] Linux
    - [ ] Mac OS X
    - [ ] Windows
    - [ ] Others:

## Version

<!-- get by running `csview --version` -->

## Problem / Steps to reproduce