add vultr (#15)

* create vultr (downloader.sh)

* update.yml - add vultr

* Update README.md

add vultr

* Update README.md

* Update downloader.sh

* Update downloader.sh

added cidr in regex for v6

* Update downloader.sh

* Update downloader.sh

vultr/downloader.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+# https://docs.vultr.com/vultr-ip-space
+# https://geofeed.constant.com/?json
+
+set -euo pipefail
+set -x
+
+
+# get from public ranges
+curl -s https://geofeed.constant.com/?text > /tmp/vultr.txt
+
+#save ipv4
+grep -v ':' /tmp/vultr.txt > /tmp/vultr-ipv4.txt
+
+#save ipv6
+grep ':' /tmp/vultr.txt > /tmp/vultr-ipv6.txt
+
+# sort & uniq
+sort -V /tmp/vultr-ipv4.txt | uniq > vultr/ipv4.txt
+sort -V /tmp/vultr-ipv6.txt | uniq > vultr/ipv6.txt