Fix bug with too many open connecitons

internal/database/articles.go

@@ -34,6 +34,7 @@ func IsSaved(store *Store, url string) bool {
 	if err != nil {
 		panic(err)
 	}
+	defer query.Close()
 
 	row := query.QueryRow(url)
 	err = row.Scan(&exists)
@@ -52,6 +53,7 @@ func ArticlesForDay(store *Store, day time.Time) (articles []model.DisplayArticl
 	if err != nil {
 		return result, err
 	}
+	defer query.Close()
 
 	tomorrow := day.AddDate(0, 0, 1)
 	todayDate := day.Format("2006-01-02")
@@ -98,6 +100,7 @@ func ArticleByID(store *Store, ID int, slug string) (article model.DisplayArticl
 	if err != nil {
 		return result, err
 	}
+	defer query.Close()
 
 	row := query.QueryRow(ID, slug)
 	if err != nil {