Tested migration script with multiple versions of WordPress plugin, single site, and multi-site.
Warned user to backup database before updating.
warning message will only show if the plugin is already active - this is built-in WordPress functionality.
Separated tokens from meeting IDs. Tokens are no longer stored and will purely be 'meeting' + post ID.
Added lint.
Updated README.txt.
Tested migration script with multiple versions of WordPress plugin, single site, and multi-site. Warned user to backup database before updating.