Update v.2.3.1/v.1.3.1

To improve SEO added bots definition functionality and reset currency for their visits
Added hook woocs_bank_polski_table for aggregator "Narodowy Bank Polsky"
New hook woocs_add_custom_rate - allows to manipulate with currency rate on the fly or even use it as own currency aggregator.
New option "Prices preloader" which shows preloader on the prices when option "I am using cache plugin on my site" is enabled
New option "Disable on pages" allows using pages slugs disable WOOCS, or if to enable reverse enable WOOCS on that pages and disable on all another of the site.
Minimum supported woocommerce version bump to v.3.4
2 new hooks woocs_announce_aggregator and woocs_add_aggregator_processor which allows to add its own custom currency aggregator.

WOOCS - WooCommerce Currency Switcher