Correct the Travis-CI link to "jup310.bsp"
Correct the Travis-CI link to "jup310.bsp"

ozialien/python-skyfield,skyfielders/python-skyfield,GuidoBR/python-skyfield,GuidoBR/python-skyfield,exoanalytic/python-skyfield,ozialien/python-skyfield,skyfielders/python-skyfield,exoanalytic/python-skyfield