Udata-croquemort

- Expose new HTTP headers related to content (`content-type`, `content-length`, `charset`, `content-md5`, `content-disposition`) [133](https://github.com/opendatateam/udata-croquemort/pull/133)

- Migrate to python3 🐍 [93](https://github.com/opendatateam/udata-croquemort/pull/93)

- Do not check FTP(S) urls [86](https://github.com/opendatateam/udata-croquemort/pull/86)

- Handle croquemort response w/o updated attr [31](https://github.com/opendatateam/udata-croquemort/pull/31)

- Switch to pytest

- Fix setup.py version