Add sems 1 and 2 to bulletinModules scraper (#1037)
Add sems 1 and 2 to bulletinModules scraper (#1037)

Sems 1 and 2 weren't being scraped. These sems were disabled in #681 as
the bulletin modules API wasn't responding. However, it seems to be back
up for AY18/19, and we also need that facultyDepartments.json file.
nusmodifications/nusmods,nusmodifications/nusmods,nusmodifications/nusmods,nusmodifications/nusmods