Various README get overwritten when unzipping global zip #49

RGI version
RGI v7.0

Describe the issue
The global zip files (e.g. RGI2000-v7.0-G-global) contains a zip files for each region. I typically run a bash loop to unzip everything, in the same folder, and then I get an annoying message saying that the README.md file already exists.

Expected outcome
The zip archives can be unzipped without overwriting files.

Suggested solution
Ideally, the README files would have different names, e.g. using the same prefix for the region, so that each README can be kept without being renamed.