'README.md' ändern

README.md

@@ -90,7 +90,7 @@ Required dependencies to run the script Main_Load_NIX_Data.m:
 Required dependencies to run the script Main_Plot_Figures.m:
 
 *  [Nix-mx v1.4.1](https://github.com/G-Node/nix-mx/)
-*  [Gramm](https://github.com/piermorel/gramm/) [![DOI](http://joss.theoj.org/papers/10.21105/joss.00568/status.svg)](https://doi.org/10.21105/joss.00568)
+*  [Gramm](https://github.com/piermorel/gramm/)
 *  [FieldTrip](http://www.fieldtriptoolbox.org/download/)
 
 ### Directory data_NIX