Update to 1.5.6

package.json

@@ -5,7 +5,7 @@
         "email": "[email protected]",
         "url": "lutzroeder.com"
     },
-    "version": "1.5.5",
+    "version": "1.5.6",
     "description": "Viewer neural network models",
     "license": "MIT",
     "repository": "lutzroeder/Netron",