Update README.md

Update stable version to v2.1.2

Author: vinser

README.md

@@ -4,7 +4,7 @@ FLibGoLite - Just enough for free OPDS
 __FLibGoLite__ is easy to use home library OPDS server you can install on your PC, NAS or server.  
 
 __[Detailed Multilingual Guides](https://vinser.github.io/flibgolite-docs/)__ are available  
-### CURRENT STABLE RELEASE v2.1.1
+### CURRENT STABLE RELEASE v2.1.2
 
 ### *Attention users of version 1 !!!*   
 The version 2 update has some improvements to the index structure, configuration and localization. Therefore, to switch to version 2, you should uninstall the version 1 service and install the version 2 service from scratch. Rendexing of the book stock of version 2 is drastically faster than in version 1, especially for FB2 archives, so the transition to version 2 can be completed with acceptable service downtime.