bugfix in travis file.
Correcting the travis file.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Merge branch 'develop'
Merge branch 'master' into develop
Add the horizon parameter to get_next_passes to get the risetime/falltime at given angle.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>