apache/pouchdb 4.0.2 on GitHub

Handle errors thrown from filter functions (#3356)
Upgrade levelup to 1.2.1, leveldown to 1.4.1, and level-sublevel to 6.5.0 (#3873)
Stateless constructor for the HTTP adpater, fixes errors syncing while offline (#4146)
Ensure document properties are maintained, e.g. docs with keys like hasOwnProperty (#3968)
Validate attachment names don't start with _ (#3357)
Correctly respect the revs_limit of 1000, trim revision trees (#4204)
Allow passing in opts to destroy() (#4219)
Update request to 2.61.0 (#4260)
Use Function.prototype.name shim consistently for IE (#4216)
Better CORS warning (#4256)