Update dotnet-stryker to version 1.3.1

Author: 0xced

.config/dotnet-tools.json

@@ -9,7 +9,7 @@
       ]
     },
     "dotnet-stryker": {
-      "version": "1.2.2",
+      "version": "1.3.1",
       "commands": [
         "dotnet-stryker"
       ]