fix the read ip list txt bug. the bug error message as following: (#170)
fix the read ip list txt bug. the bug error message as following: (#170)

time="2019-07-28 01:39:07" level=error msg="Error parsing IP network CIDR 223.240.0.0/13\n: invalid CIDR address: 223.240.0.0/13\n"
the ReadString will not trim the delimiter, so the "\n" still keep in line.
shawn1m/overture,holyshawn/overture,shawn1m/overture,holyshawn/overture