Updated commands.py to use latin-1 as decoder

As posted [here](http://python-notes.curiousefficiency.org/en/latest/python3/text_file_processing.html#files-in-an-ascii-compatible-encoding-best-effort-is-acceptable), we should use `latin-1` to get the same behavior we saw with python 2.
Merge pull request #1 from dxshank/patch-1

Updated commands.py to use latin-1 as decoder