Initial filter_not_subscribed implementation and test.
Bugfix and first passing test.
More tests for filter_not_subscribed.
Test filter_not_subscribed runs in one query.
Documentation for filter_not_subscribed.
Documenation clarification.
Bump minor version number.
Entity type filtering based on id.
Merge pull request #4 from Wilduck/is-subscribed-filtering

Is subscribed filtering