Compatibility with LiteSpeed Cache plugin

Hi, this is from LiteSpeed Cache plugin dev team.

We got a feedback from one of our clients. We found there is a compatibility issue with cache when enable/disable coming soon mode in your plugin.

As we found the place you saved setting is in framework/framework.php line 253, could you please do a purge action when setting is changed? To make it, please have the following code included when saving setting (before any html output):
method_exists( 'LiteSpeed_Cache_API', 'purge_all' ) && LiteSpeed_Cache_API::purge_all() ;

Thanks a lot.

Our API doc is in https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:cache:lscwp:api#api

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