Pulling from insecure registries is not supported

[nponeccop]

./pullcontainer -o foo 104.222.111.88:44444/bar

Invalid registry endpoint https://104.222.111.88:44444/v1/: Get https://104.222.111.88:44444
/v1/_ping: EOF. If this private registry supports only HTTP or HTTPS with an unknown CA certificate, 
please add `--insecure-registry 104.222.111.88:44444` to the daemon's arguments. In the case of 
HTTPS, if you have access to the registry's CA certificate, no need for the flag; simply place the CA 
certificate at /etc/docker/certs.d/104.222.111.88:44444/ca.crt
panic: runtime error: invalid memory address or nil pointer dereference