**Is your feature related to a problem? Please describe**

A clear and concise description of what the problem is.
e.g. I'm always frustrated when [...]; gexiv2 does not support XXX

**Describe the solution that you would like**

A short description of what you want to happen.

**Describe alternatives that you have considered**

Any other solutions or features available elsewhere. e.g. 
py3exiv2 can do XXX.

**Additional context**

Add any other content about the feature request. e.g. screenshots, 
URLs, etc
