SUSPENDED subscriptions can be renewed

Stuck trigger can move subscriptions to suspended with a setting

Update search_fields to use Django 2.2 syntax

Fixed failing test on py2 (timezones)

Bump version 1.0.1

Trigger Suspended uses the end date rather than last updated date Fixes 

#11 (#12)

* Trigger Suspended uses the end date rather than last updated date

Type hints don't work for py2.7 :(

Prepare release of 0.5.0

Bump version to 0.4.0

Release v0.3.0