* Add release highlights and pin rc version

* review actions

Tweak release highlights

* Add failing test of plotting

* Implement fix to pass test

* Update idiff to ignore irrelevant hyphens in path

* Update imagerepo (following docs)

* Update after review by @trexfeathers

* Add whatsnew entries

* Move whatsnew entries into correct file

* Minor phrasing change in 'Release candidate'.

* Before release deprecations.

* Whatsnew highlights section.

* Updated CF saver version in User Guide and docstring

* Remove references to CF version of the loader in docstrings

* Added whatsnew

* Pin cftime<1.3.0

* migrate from travis-ci to cirrus-ci

* added whatsnew entries

* Use Title Case Capitalisation for Documentation

* add whatsnew enter

* requirements pip to conda

* use pip install over develop

* default PY_VER to python versions

* update links

* added s to http

* drop stickler references in docs

* remove sticker from common links

* update docs for travis-ci to cirrus-ci

* add 'travis-ci' reference locally to whatsnew

* update whatsnew comment

* docs for nox

* add titles, notices and additional detail

* review actions

* test coverage for __init__ and __call__

* test coverage for metadata resolve and coverage

* partial test coverage for metadata mapping

* python 3.6 workaround for deepcopy of mock.sentinel

* test coverage for Resolve._free_mapping

* test coverage for Resolve convenience methods

* add test stub for Resolve._metadata_mapping

* fix Test__tgt_cube_position

* test coverage for shape

* test coverage for _as_compatible_cubes

* test coverage for Resolve._metadata_mapping

* test coverage for Resolve._prepare_common_dim_payload

* test coverage for Resolve._prepare_common_aux_payload

* test coverage for Resolve._prepare_points_and_bounds

* test coverage for Resolve._create_prepared_item

* test coverage for Resolve._prepare_local_payload_dim

* test coverage for Resolve._prepare_local_payload_aux

* test coverage for Resolve._prepare_local_payload_scalar + docs URL skip

* test coverage for Resolve._prepare_local_payload

* test coverage for Resolve._metadata_prepare

* added docs URL linkcheck skip

* test coverage for Resolve._prepare_factory_payload

* test coverage for Resolve._get_prepared_item

* review actions

* test coverage for Resolve.cube