don't use lateinit in CacheController()

src/main/kotlin/org/mosad/thecitadelofricks/APIController.kt

@@ -60,12 +60,12 @@ class APIController {
     // TODO remove this with API version 2.0.0
     @Deprecated("courses is replaced by courseList", replaceWith = ReplaceWith("courseList()"))
     @RequestMapping("/courses")
-    fun courses(): CourseList {
+    fun courses(): CoursesList {
         return courseList()
     }
 
     @RequestMapping("/courseList")
-    fun courseList(): CourseList {
+    fun courseList(): CoursesList {
         logger.info("courseList request at ${LocalDateTime.now()}!")
         updateTotalRequests()
         return courseList