earthobservations/wetterdienst: Release 0.9.0

Abstract

Large refactoring Make period type in DWDObservationData and cli optional Activate SQL querying again by using DuckDB 0.2.2.dev254. Thanks, @Mytherin! Fix coercion of integers with nans Fix problem with storing IntegerArrays in HDF Rename DWDStationRequest to DWDObservationData Add DWDObservationSites API wrapper to acquire station information Move discover_climate_observations to DWDObservationMetadata.discover_parameters Add PDF-based DWDObservationMetadata.describe_fields() Upgrade Docker images to Python 3.8.6 Move intermediate storage of HDF out of data collection Fix bug with date filtering for empty/no station data for a given parameter Radar data: Add non-RADOLAN data acquisitio