Add binary marshal for Redis on Course struct

types.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
 	"strconv"
 	"strings"
@@ -302,3 +303,7 @@ type Course struct {
 	Faculty         []FacultyItem         `json:"faculty"`
 	MeetingsFaculty []MeetingTimeResponse `json:"meetingsFaculty"`
 }
+
+func (course Course) MarshalBinary() ([]byte, error) {
+	return json.Marshal(course)
+}