Merge pull request #1637 from BENR0/feat_default_filename_cf_writer

Change default filename for cf writer to be compatible with satpy_cf_nc reader

satpy/etc/writers/cf.yaml

@@ -2,6 +2,6 @@ writer:
   name: cf
   description: Generic netCDF4/CF Writer
   writer: !!python/name:satpy.writers.cf_writer.CFWriter
-  filename: '{name}_{start_time:%Y%m%d_%H%M%S}.nc'
+  filename: '{platform_name}-{sensor}-{start_time:%Y%m%d%H%M%S}-{end_time:%Y%m%d%H%M%S}.nc'
   compress: DEFLATE
   zlevel: 6