[HOLD] Read equivalents in from a json file

[cclauss]

To be done AFTER pull request https://github.com/ubershmekel/python3wos/pull/31 is accepted.

[cclauss]

This must not be the only way to inject equivalents because the following packages also seem to have equivalents:

• Django
• ssl
• python-memcached
• dnspython
• zc.recipe.egg
• xlwt