Bump version (conf, setup, whatsnew) to v0.3.2. (#116)

* Bump version (conf, setup, whatsnew) to v0.3.2.

* Update user guide on opening datasets.

* Add warning about CHELSA-W5E5 in whatsnew.

* Add release description.

* Fix a typo.

* And another typo.

v0.3.0 Cocuy

v0.2.0 Bale

v0.1.0 Akaishi