Binary usage

I'm seeing that binaries might not be being garbage collected in this library.

```
:recon.bin_leak(1)
[
  {#PID<0.1871.0>, -11627,
   [
     :reunion,
     {:current_function, {:gen_server, :loop, 7}},
     {:initial_call, {:proc_lib, :init_p, 5}}
   ]}
]
```

Any idea what could be causing this?