Almost ready to migrate to SSL!
Some things can't be done automatically. Before you migrate, please check for:
Http references in your .css and .js files: change any http:// into //
Images, stylesheets or scripts from a domain without an SSL certificate: remove them or move to your own server.
It is recommended to take a backup of your site before activating SSL
You can also let the automatic scan of the pro version handle this for you, and get premium support, increased security with HSTS and more! Check out Really Simple SSL Premium
https://kasiaaleszczyk.pl/ssl-wordpressie-nawet-wiesz-proste