docs: version number bumb

Author: Neo23x0

welcome.txt

@@ -4,4 +4,4 @@
    / ___ |/ ____/ / /  ___/ / / / / / / / /_/ / / /_/ / /_/ /_/ / /    
   /_/  |_/_/     /_/  /____/_/_/ /_/ /_/\__,_/_/\__,_/\__/\____/_/     
 
-  Florian Roth, Nextron Systems, v0.9.0, June 2021
+  Florian Roth, Nextron Systems, v0.9.1, June 2021