Updated text in README.md

README.md

-# KC-Addon
+# KohlNumbra-Addon (formerly KC-Addon)
 
 This extension for LynxChan 2.7.x contains numerous functions which complement it to the needs of a steady image board in conjunction with the front end [KohlNumbra](https://gitgud.io/kohlchan-dev/KohlNumbra).