Previous API for search now retired

[PamirGhimire]

landsatxplore search now returns an exception
command : landsatxplore search --dataset LANDSAT_TM_C1 --location 12.53 -1.53 --start 1995-01-01 --end 1995-12-31
exception :
...landsatxplore/api.py", line 50, in login
raise EarthExplorerError('EE: {}'.format(response['error']))
landsatxplore.exceptions.EarthExplorerError: EE: This API has been retired and replaced by the API at https://m2m.cr.usgs.gov