Merge pull request #33 from allegro/release-1.8.0

Bumped version to 1.8.0
Fix nested field in CSV export.
Merge pull request #35 from quamilek/fix/nested-field-csv

Fix/nested field csv
Bumped version to 1.8.1
Merge pull request #37 from allegro/release-1.8.1

Release 1.8.1