Rendering fix

Fixes error:
````
buffer.js:246
  switch (encoding && encoding.toLowerCase()) {
                               ^
TypeError: Object 1 has no method 'toLowerCase'
    at Function.Buffer.isEncoding (buffer.js:246:32)
    at assertEncoding (fs.js:112:27)
    at Object.fs.writeSync (fs.js:531:5)
    at SyncWriteStream.write (fs.js:1751:6)
    at Object.<anonymous>
(/Users/dradcliffe/src/deanius/dependito/bin/dependito:55:16)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
````