Non determinism

[tynes]

While testing out the provided examples, I noticed a case of nondeterminism
After cloning the repo down and running npm install:

$ while true; do node examples/bcoin-getXPUBs.js; sleep 1; done

{ Error: Incorrect sequence number.
    at ProtocolReader.readFirstMessage (/Users/marktyneway/Projects/github.com/bpanel-org/bledger/lib/protocol/ledgerprotocol.js:298:10)
    at ProtocolReader.pushMessage (/Users/marktyneway/Projects/github.com/bpanel-org/bledger/lib/protocol/ledgerprotocol.js:356:19)
    at HIDDevice._exchange (/Users/marktyneway/Projects/github.com/bpanel-org/bledger/lib/devices/ledgerhid.js:223:14)
    at <anonymous> type: 'ProtocolError', message: 'Incorrect sequence number.' }
Account: m/44'/0'/0' addresses:
  /0/0: ...
  /1/0: ...

  /0/1: ...
  /1/1: ...

  /0/2: ...
  /1/2: ...

  /0/3: ...
  /1/3: ...

It will sometimes return the addresses as expected in examples/bcoin-getXPUBs.js but other times it will result in the above error