Log Message:
py-dicttoxml: updated to 1.7.15

Version 1.7.15

Fixed issue 43
Implemented issue 82
Small fixes to readme.md

Version 1.7.14

Handle floating point keys as per issue 61
Option to return string instead of bytes as per issue 55
Reorganized readme.md to have a better flow.

Version 1.7.13

Fixed issue 53, dicttoxml(None) and dicttoxml("name") break in 1.7
Fixed issue 96, update readme section on debugging

Version 1.7.12

Fixed issue 95: changed project.toml to support Python 3.6+ and updated readme \ 
documentation.