update types

Author: AJaccP

src/types/course.ts

@@ -11,6 +11,6 @@ export interface Course {
   credits: number; // e.g. 0.5
   description: string;
   prereq: Prereq | null;
-  prereqRaw?: string;  // raw string from calendar, populated by scraper
+  prereqRaw: string | null; // raw string from calendar; null for hand-crafted entries
   precludes: string[]; // course codes
 }