update differ to latest which should yield less verbose release notes for this repos with many nuget packages

Mpdreamz · Mpdreamz · commit 4889172e083a · 2020-05-28T10:23:16.000+02:00
diff --git a/dotnet-tools.json b/dotnet-tools.json
@@ -9,7 +9,7 @@
       ]
     },
     "assembly-differ": {
-      "version": "0.12.3",
+      "version": "0.12.5",
       "commands": [
         "assembly-differ"
       ]
