Create 5.0-to-5.1.md

.github/migrations/5.0-to-5.1.md

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+# ASF V5.0 -> V5.1
+
+## Plugins
+
+### `SelectElementNodes(...)`, `SelectNodes(...)`
+
+Previously returned `List<IElement>`, now returns `IEnumerable<IElement>`
+
+https://github.com/JustArchiNET/ArchiSteamFarm/commit/65dc5def01b4208dd019685c8724d88f82d2902f
+
+#### Proper solution
+
+Use `IEnumerable<IElement>` where you've previously used `List<IElement>`. If you're just enumerating over results, you don't need a full collection, we didn't need it anywhere in ASF code when doing this change.
+
+#### Alternative solution
+
+Just call `.ToList()` on the result yourself.