Trailing newline in TLE source breaks fetch_tle_from_url

Steps to reproduce

from satellite_tle import fetch_tles                                                                                  
tles = fetch_tles([25544,4298])                                                                                       

This produces the following error log:

----> 1 tles = fetch_tles([25544,4298])

/path/satellite_tle/fetch_tles.py in fetch_tles(requested_norad_ids, verify)
     51         logging.info('Fetch from {}'.format(url))
     52         try:
---> 53             new_tles = fetch_tles_from_url(url=url, verify=verify)
     54             logging.debug('Found TLEs for {}'.format(list(new_tles.keys())))
     55         except (requests.HTTPError, requests.Timeout):

/path/satellite_tle/fetch_tle.py in fetch_tles_from_url(url, verify)
     88     # Loop over TLEs
     89     for i in range(len(lines) - 2):
---> 90         if (lines[i + 1][0] == "1") & (lines[i + 2][0] == "2"):
     91             try:
     92                 twoline2rv(lines[i + 1], lines[i + 2], wgs72)

IndexError: string index out of range

Explanation

Currently https://www.amsat.org/amsat/ftp/keps/current/nasabare.txt contains a trailing newline.