chore: freeze travis version
chore: freeze travis version

waiting for the resolution of a known bug
https://github.com/transifex/transifex-client/issues/207

y-lohse/cozy-drive,goldoraf/cozy-drive,cozy/cozy-files-v3,nono/cozy-files-v3,y-lohse/cozy-drive,y-lohse/cozy-files-v3,enguerran/cozy-drive,enguerran/cozy-drive,nono/cozy-files-v3,y-lohse/cozy-drive,nono/cozy-files-v3,goldoraf/cozy-drive,cozy/cozy-files-v3,goldoraf/cozy-drive,y-lohse/cozy-drive,enguerran/cozy-drive,cozy/cozy-files-v3,enguerran/cozy-drive,y-lohse/cozy-files-v3,cozy/cozy-files-v3,nono/cozy-files-v3,goldoraf/cozy-drive,y-lohse/cozy-files-v3