MiniSeedInputClient: Encode data as float32

Recent edits to MiniseedInputClient resulted in the following error:

Wrong dtype for Stream[0].data for encoding FLOAT32. Please change the dtype of your data or use an appropriate encoding. See the obspy.io.mseed documentation for more information.

Support for specifying encodings in stream.write(...) seems to have change behavior in obspy 2.0.

Related issue: https://github.com/obspy/obspy/issues/1095

mentioned in merge request !82 (merged)

closed with merge request !82 (merged)

mentioned in commit 3ba0c794

changed milestone to %Miniseed Pipeline