v 0.3.4 official release

This is a major release allowing time-series albedo to be passed into setGround(). Weather data that is left-labeled (SAM, PVSYST) or center-labeled (NSRDB) can now be specified in readWeatherFile(). Support for Python 2.7 is now removed.

See what's new at bifacial-radiance.readthedocs.io.