* Fix broken imports, some warnings
* Fix tests broken by changed single-quote escaping
* Loosen number of queries assertion to allow less than, as django 3.0 optimized away one query
* Update travis to run against django 3.0
* flake8
* Compat for contextmanager
* contextmanager didn't move, IDE was confused
* Build docs on 2.2 until gdal bug fixed
* Get debug output from travis about currently installed packages
* Fix less-than assertion
* Temporarily skip building docs under django 3.0
* Fix exclusion-by-env line
* Undo attempt to workaround GDAL; exclusion line isn't going to work
* Revert useless exclusion attempt
* Attempt updating gdal from PPA
* Try building on bionic
* Drop 3.5 support for Django 3.0
* Try other specifier for mod_spatialite
* Exclude python 3.5 from django 3.0 matrix
* Fix for force_str vs force_text under python 2
* Missing django for py35-docs
* Fix examples using render_to_response (deprecated) in docs
* Update docs, version, release notes