v0.3.0

Breaking Changes

• eq2hor and hor2eq now take as mandatory arguments either the name of an
  observatory in AstroLib.observatories or the coordinates (latitude,
  longitude and, optionally, altitude) of the observing site. Keywords lat,
  lon, altitude and obsname are no longer accepted. There is no more a
  default observing site, you always have to provide it.