I/O metadata for generate_matrix

Fixes #15 (closed)

geomagio/processing/adjusted.py

@@ -45,7+45,7 @@
         readings = WebAbsolutesFactory(url=webabsolutes_url).get_readings(
             observatory=observatory,
             starttime=UTCDateTime(readings_starttime),
             endtime=UTCDateTime(readings_endtime),
         )
     elif input_factory == "metadata":
         metadata = MetadataFactory(url=metadata_url).get_metadata(
@@ -54,7+54,7 @@
                 starttime=readings_starttime,
                 endtime=readings_endtime,
                 category=MetadataCategory.READING,
+                data_valid=True,
+                metadata_valid=True,
             )
         )
         readings = [Reading(**m.metadata) for m in metadata]