Add DISCO_F429ZI to the blacklist

Author: niklarm

test/filters.json

@@ -1,6 +1,6 @@
 {
     "blacklist" : [ {
-        "platforms" : ["EFM32GG_STK3700"]
+        "platforms" : ["EFM32GG_STK3700", "DISCO_F429ZI"]
         }
     ]
 }