add kcc 6.1 7z note

README.md

@@ -70,9 +70,9 @@ If you have issues detecting it, or use another OS, refer to the wiki: https://g
 
 ### 7-Zip
 
-This is an optional requirement as of KCC 6.1.0. You only need to install it if 1) you are using advanced features, 2) are using Windows 10 (2017) or earlier, or 3) need to use an older KCC version.
+This is no longer required as of KCC 6.1. 
 
-If you need to install it, refer to the wiki: https://github.com/ciromattia/kcc/wiki/Installation#7-zip
+If you still need it, refer to the wiki: https://github.com/ciromattia/kcc/wiki/Installation#7-zip
 
 ## INPUT FORMATS
 **KCC** can understand and convert, at the moment, the following input types: