Fixing the file name of the log file for travis.
Fixing the file name of the log file for travis.

OurWorldInData/owid-grapher,owid/owid-grapher,aaldaber/owid-grapher,OurWorldInData/our-world-in-data-grapher,OurWorldInData/owid-grapher,owid/owid-grapher,OurWorldInData/owid-grapher,OurWorldInData/owid-grapher,aaldaber/owid-grapher,owid/owid-grapher,owid/owid-grapher,aaldaber/owid-grapher,owid/owid-grapher,OurWorldInData/our-world-in-data-grapher,OurWorldInData/owid-grapher,OurWorldInData/our-world-in-data-grapher,aaldaber/owid-grapher,OurWorldInData/our-world-in-data-grapher,aaldaber/owid-grapher