fix bug with utf8mb4
fix bug with utf8mb4

kwangkim/wallabag,modos189/wallabag,mubassirhayat/wallabag,wangjun/wallabag,antoniosejas/wallabag,wangjun/wallabag,ekospinach/wallabag,mubassirhayat/wallabag,kwangkim/wallabag,modos189/wallabag,antoniosejas/wallabag,harikt/wallabag,ekospinach/wallabag,harikt/wallabag,wangjun/wallabag,antoniosejas/wallabag,mubassirhayat/wallabag,ekospinach/wallabag,kwangkim/wallabag,modos189/wallabag,harikt/wallabag