Updated README.md with Windows requirements
Updated README.md with Windows requirements

Not very challenging since there are no requirements under Windows, at least since we got rid of cjson (precompiled pycurl can be retrieved from PyPI).

Change-Id: I8c29c3c43d83fffdc5bf260da6ddaf8727bb0ca2
Reviewed-on: https://gerrit.franz.com:9080/6862
Reviewed-by: Tadeusz Sznuk <4402abb98f9559cbfb6d73029f928227b498069b@franz.com>
Reviewed-by: Ahmon Dancy <8f7d8ce2c6797410ae95fecd4c30801ee9f760ac@franz.com>
Tested-by: Ahmon Dancy <8f7d8ce2c6797410ae95fecd4c30801ee9f760ac@franz.com>

franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python