XMLSyntaxError when saving files w/ keep_vba = True
*Created originally on Bitbucket by [thoboyle (Thomas O'Boyle)](https://bitbucket.org/%7B3d4d336e-70d1-406b-b168-dd6f311ae109%7D/)* I haven't been able to find if this is simply a bug with version 2.3.x but I am unable to open and successfully save files where keep_vba=True. For example: wb = openpyxl.load_workbook('doc.xlsm', keep_vba=True) .. wb.save('doc2.xlsm') fails with: lxml.etree.XMLSyntaxError: Opening and ending tag mismatch: br line 95 and b, line 96, column 12 even if no changes are made to the file.
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