Cartopy 0.18.0

Major changes include:

* Support for building against Proj 6.
* Support for Python 3.7 and 3.8.
* Support for Matplotlib 3.2 and 3.3.
* Support for labelling gridlines on all projections.
* Support for labelling gridlines within plot boundaries instead of
  edges.
* Support for labelling of contours.

and many others.

There are several bug fixes as well. See [the
milestone](https://github.com/SciTools/cartopy/milestone/25?closed=1)
for more information.

Cartopy 0.18.0 release candidate 1

Major changes include:

* Support for building against Proj 6.
* Support for Python 3.7 and 3.8.
* Support for Matplotlib 3.2 and 3.3.
* Support for labelling gridlines on all projections.
* Support for labelling gridlines within plot boundaries instead of
  edges.
* Support for labelling of contours.

and many others.

There are several bug fixes as well. See [the
milestone](https://github.com/SciTools/cartopy/milestone/25?closed=1)
for more information.

Cartopy 0.18.0 beta 2

Major changes include:

* Support for building against Proj 6.
* Support for Python 3.7 and 3.8.
* Support for Matplotlib 3.2 and 3.3.
* Support for labelling gridlines on all projections.
* Support for labelling gridlines within plot boundaries instead of
  edges.
* Support for labelling of contours.

and many others.

There are several bug fixes as well. See [the
milestone](https://github.com/SciTools/cartopy/milestone/25?closed=1)
for more information.

Cartopy 0.18.0 beta 1

Major changes include:

* Support for building against Proj 6.
* Support for Python 3.7 and 3.8.
* Support for Matplotlib 3.2 and 3.3.
* Support for labelling gridlines on all projections.
* Support for labelling gridlines within plot boundaries instead of
  edges.
* Support for labelling of contours.

and many others.

There are several bug fixes as well. See [the
milestone](https://github.com/SciTools/cartopy/milestone/25?closed=1)
for more information.

Merge pull request SciTools#1200 from dopplershift/whatsnew-0.17

Update what's new for 0.17

Merge pull request SciTools#1028 from pelson/whats_new_0.16

Prepared the what's new for v0.16.

Merge pull request SciTools#862 from dkillick/v0151

Bump version to v0.15.1

Merge pull request SciTools#850 from lbdreyer/version_fix

Update other version numbers .

Add a user/site specified background image directory (SciTools#815)

* Added code to include user defined background image library.

14.3 version