feat: register fifth day

internal/2017/register.go

@@ -1,6 +1,7 @@
 package year2017
 
 import (
+	_ "advent-of-code/internal/2017/DayFive"
 	_ "advent-of-code/internal/2017/DayFour"
 	_ "advent-of-code/internal/2017/DayOne"
 	_ "advent-of-code/internal/2017/DayThree"