Cannot specify a hostname for memcapable

[Tony Gregerson]

It is not possible to specify a hostname for memcapable in version 1.0.18, making the tool unusable.

gregerson@my-instance:~$ memcapable
Failed to connect socket: Connection refused
Failed to connect to <(null):11211>: Connection refused

gregerson@my-instance:~$ memcapable -h 1.2.3.4
No hostname was provided.

Here is the fix:
On line 2153 of memcapable.cc

if (hostname)

should instead be:

if (!hostname)