ip.sb更新ipv6导致cloudflare的ddns无法使用

ip.sb的api更改了，需要使用如下命令

curl -4 ip.sb

因此cloudflare的ddns.sh需要更改，代码如下：

#!/bin/bash
dynamic_ip=`curl -4 ip.sb`
curl -X PUT "https://api.cloudflare.com/client/v4/zones/21eeeeeeeeeeeeeeeeeeeee/dns_records/926rrrrrrrrrrrrrrrrr" \
    -H "X-Auth-Email: d1@gmail.com" \
    -H "X-Auth-Key: c3bbbbbbbbbbbbbbbb" \
    -H "Content-Type: application/json" \
    --data '{"type":"A","name":"www","content":"'${dynamic_ip}'","ttl":180,"proxied":false}'