Django-heroku-connect

Changed

- CI: Added a separate stage for publishing package in PyPI (https://github.com/Thermondo/django-heroku-connect/commit/8d07c3fabb4a6e3f0d02036e7e36aa0e98f69d41)

Changed

Fix Travis config to trigger PyPI releases (0.19.0 was not released due to that).

Added
- `is_deleted` now contains `db_index` (https://github.com/Thermondo/django-heroku-connect/pull/85)

Changed
- use absolute imports all over the code (https://github.com/Thermondo/django-heroku-connect/pull/87)
- use `tox-travis` for better and simpler CI configuration (https://github.com/Thermondo/django-heroku-connect/pull/88)
- documentation fixes (https://github.com/Thermondo/django-heroku-connect/pull/78 and https://github.com/Thermondo/django-heroku-connect/pull/79)

* Fix Django 3.0 deprecation warning for from_db_value (77)

* Allow `HEROKU_CONNECT_SCHEMA` to be set via environment (75)

* Fix typo in import_mappings command 73