Update exception files

Author: miniwolf

Packages/com.unity.ide.visualstudio/ValidationExceptions.json

@@ -0,0 +1,15 @@
+{
+    "ErrorExceptions": [
+        {
+            "ValidationTest": "API Validation",
+            "ExceptionMessage": "Breaking changes require a new major version.",
+            "PackageVersion": "2.0.18"
+        },
+        {
+            "ValidationTest": "API Validation",
+            "ExceptionMessage": "Additions require a new minor or major version.",
+            "PackageVersion": "2.0.18"
+        }
+    ],
+    "WarningExceptions": []
+}