Problem with model2json

As you provided a python script. **./tool/model2json**, to convert model to json file. When i am running this script with my model i am getting error:

`TypeError: write() argument must be str, not bytes`

Getting this error make sense because, how can you write bytes to a file that is opened in string mode. At line
`model = base64.b64encode(bytes(open(sys.argv[3], 'rb').read()))`

You are reading it in bytes but in line

`with open(sys.argv1, 'w') as fo:`

you are opening file in string mode and in line

`fo.write(model)`

You are writing bytes to string.
May be i am missing something, help me out with this.