Release v0.2.0

Includes the conductivity calculation which justifies the minor version
updated as opposed to just the patch level.

Includes some doc updates.

Changes to GH actions for CI and CD.

src/eppaurora/__init__.py

@@ -11,7 +11,7 @@
 ionization and recombination rates for precipitating
 auroral (100 eV--30 keV) and radiation-belt (30 keV--1 MeV) electrons.
 """
-__version__ = "0.1.1dev0"
+__version__ = "0.2.0"
 
 from .brems import *
 from .conductivity import *