Gokart

New feature

- Support no specification load single dataframe 180

class Task(gokart.TaskOnKart):
bar = gokart.TaskInstancePrameter()

def run(self):
df = self.load_data_frame() We won't have to write "bar" about it because it's obvious

BUGFIX
* make s3 config singleton (178) mski-iksm
* support python 3.9 (173) hirosassa

Refactoring
* fix minor deps (175) hirosassa
* Feature/use isort (177) mski-iksm
* fix badges and cleanup whitespace (174) hirosassa

minor fix and improve CI
- Suppress redundant warning messages by mski-iksm
- tox test for multiple python versions by hirosassa

Changes

- packaging setup.py -> poetry

New Feature
* Feature/efficient task lock 162 by mski-iksm

New feature
- Careful assertion on empty dump 165 by Hi-king

CI Improvement
- Migrate to GitHub Actions 161 by hirosassa

Minor fixes
- fix readme link miss 163 by mski_iksm
- hotfix: ill formed format.xml 164 by Hi-king