IMPORTANT: Update your exposed instances to 1.6.2

[fmartingr]

IMPORTANT ANNOUNCEMENT

This only applies to instances running a Shiori server exposed to untrusted networks or the internet.

A security vulnerability has been discovered in 1.6.0 and 1.6.1 where the new v1 API endpoint logic was exposed, incomplete and unsecured.

A new 1.6.2 release has been cut that removes those endpoints, we encourage users to update to this version as soon as possible.