Added categories to setup.py.
Added categories to setup.py.

gechong/XlsxWriter,liukaijv/XlsxWriter,seize-the-dave/XlsxWriter,yaojingwu1992/XlsxWriter,applicationdevm/XlsxWriter,seize-the-dave/XlsxWriter,jkyeung/XlsxWriter,jvrsantacruz/XlsxWriter,Thhhza/XlsxWriter,jmcnamara/XlsxWriter,applicationdevm/XlsxWriter,yaojingwu1992/XlsxWriter,jkyeung/XlsxWriter,seize-the-dave/XlsxWriter,liukaijv/XlsxWriter,liukaijv/XlsxWriter,yaojingwu1992/XlsxWriter,applicationdevm/XlsxWriter,seize-the-dave/XlsxWriter,mdeemer/XlsxWriter,jmcnamara/XlsxWriter,gechong/XlsxWriter,mdeemer/XlsxWriter,jvrsantacruz/XlsxWriter,yaojingwu1992/XlsxWriter,gechong/XlsxWriter,mdeemer/XlsxWriter,jvrsantacruz/XlsxWriter,mdeemer/XlsxWriter,jkyeung/XlsxWriter,liukaijv/XlsxWriter,jmcnamara/XlsxWriter,Thhhza/XlsxWriter,jvrsantacruz/XlsxWriter,applicationdevm/XlsxWriter,gechong/XlsxWriter,Thhhza/XlsxWriter,jkyeung/XlsxWriter,jmcnamara/XlsxWriter,Thhhza/XlsxWriter