Add missing dependency to insall using cpanminus

[mvschaik]

This will solve the failing tests when installing:

#   Failed test 'use Net::RabbitFoot::Cmd::Command::declare_queue;'
#   at t/00_compile.t line 11.
#     Tried to use 'Net::RabbitFoot::Cmd::Command::declare_queue'.
#     Error:  Can't locate MooseX/Getopt.pm in @INC (...) at .../Module/Runtime.pm line 317.