Update README.md

Author: AveYo

README.md

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 Very fast encoding and decoding BAT85 and BAT91 classes  
 Multiple file(s) and folder(s) "Send to" menu selection  
 
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 ## What's new in v6.0 final:  
 GUI option 1: Input decoding key as password - saved in external file "output~key.ini"  
 GUI option 2: Randomize decoding key (use with 1)