Dynamodb-csv

<!-- Release notes generated using configuration in .github/release.yaml at master -->

What's Changed
Improvements
* Setup pytest-mock and add main.py tests by danishi in https://github.com/danishi/dynamodb-csv/pull/27
* Return type hinting by danishi in https://github.com/danishi/dynamodb-csv/pull/28
* Exit code optimization by danishi in https://github.com/danishi/dynamodb-csv/pull/29


**Full Changelog**: https://github.com/danishi/dynamodb-csv/compare/v1.3.3...v1.3.4

<!-- Release notes generated using configuration in .github/release.yaml at master -->

What's Changed
Improvements
* Test environment optimization by danishi in https://github.com/danishi/dynamodb-csv/pull/19
* Setting venvFolders by danishi in https://github.com/danishi/dynamodb-csv/pull/20
* Add Comment with Google Style Python Docstrings by danishi in https://github.com/danishi/dynamodb-csv/pull/23
* Add type hints by danishi in https://github.com/danishi/dynamodb-csv/pull/26
Other Changes
* Add an eye-catching image by rienru in https://github.com/danishi/dynamodb-csv/pull/25

New Contributors
* rienru made their first contribution in https://github.com/danishi/dynamodb-csv/pull/25

**Full Changelog**: https://github.com/danishi/dynamodb-csv/compare/v1.3.2...v1.3.3

New Features
* reviewdog setting 16 17
* Setup devcontainer

Improvements
* Add .gitattributes 15
* Editor setting and testcode brush up 18

Bug Fixes

New Features

Improvements
* Python 3.6 version support 14

Bug Fixes

New Features
* New feature CSV export command 13

Improvements
* Test using boto3 mock 12

Bug Fixes

New Features

Improvements
* Check config.ini file exist 10
* set python support version 11

Bug Fixes
* fix import error 9