allow compressed file (#14)

* allow compressed file

* empty commit

* fix

check db_url just before actual operation is executed (#13)

Add chunking insertion (#11)

* add chunking insertion

* fix chunk_size validation

fix to set doublequote option to be True if no option passed (#7)

Update README (#5)

* update readme

* add explanatio for --pre-sql and --post-sql options

Configure CircleCI (#3)

* add CircleCI config

* add entire .gitignore

* add noqa flag for flake8