test failures modules/redis

[duckfez]

At commit 97ba87c0e70661e1263631288b0cab41acebbbae:

dwaddle@rick:~/go/src/github.com/zmap/zgrab2/modules/redis$ go test
# github.com/zmap/zgrab2/modules/redis [github.com/zmap/zgrab2/modules/redis.test]
./types_test.go:124:27: cannot use &fakeio (value of type *fakeIO) as net.Conn value in struct literal: *fakeIO does not implement net.Conn (missing method Close)
FAIL    github.com/zmap/zgrab2/modules/redis [build failed]