Fix sporadic error

[TooTallNate]

Happens occasionally...

  Error: Offset is out of bounds
      at Object.fs.readSync (fs.js:476:19)
      at sync (/Users/nrajlich/cloudup-cli/node_modules/head/index.js:38:14)
      at module.exports (/Users/nrajlich/cloudup-cli/node_modules/head/index.js:19:10)
      at textual (/Users/nrajlich/cloudup-cli/bin/up:153:13)
      at Socket.files.forEach.ind (/Users/nrajlich/cloudup-cli/bin/up:105:11)
      at Socket.EventEmitter.emit (events.js:117:20)
      at _stream_readable.js:920:16
      at process._tickCallback (node.js:415:13)