fixing extra bracket and missing paren in ext-py/parquet/bitstring.py

[c6stephens]

It looks like this file has an extra ] and a missing (.

This file doesn't compile under Python 2.7:

$ python desktop/core/ext-py/parquet-python/parquet/bitstring.py
  File "desktop/core/ext-py/parquet-python/parquet/bitstring.py", line 4
    ]
    ^
SyntaxError: invalid syntax
$ python desktop/core/ext-py/parquet-python/parquet/bitstring.py
  File "desktop/core/ext-py/parquet-python/parquet/bitstring.py", line 19
    byte_index, bit_offset = divmod(self.offset + key), 8)
                                                         ^
SyntaxError: invalid syntax

Interestingly, the ] bracket was deleted upstream, but the ( paren wasn't added?

I've started a pull request upstream.

[romainr]

Thanks!

Nice catch and thanks for also doing the upstream pull request!