Update README.md to add a note that the project is no longer maintained

README.md

@@ -1,5 +1,11 @@
 # GoodBudget to YNAB Importer
 
+---
+
+**Please note:** This project is not actively maintained, it may no longer work and may depend on out of date dependencies.
+
+---
+
 ## What is this?
 [YNAB (You Need a Budget)](https://www.youneedabudget.com/) and [GoodBudget](https://goodbudget.com/) are personal finance apps.
 
@@ -93,4 +99,4 @@ GoodBudget lets you set your preferred date format in the settings. This default
 
 * **Re-run index** (default: 0):
 
-This is a bit of a weird option that you probably don't need to use. This relates to the `import_id` we provide to YNAB. While experimenting with the importer I wanted to delete my transactions but even after deleting the transactions YNAB still recognised the transactions as being duplicates. If you ever do want to re-import transactions on purpose then just set this to a different value to any previous exports and the `import_ids` will all change!
+This is a bit of a weird option that you probably don't need to use. This relates to the `import_id` we provide to YNAB. While experimenting with the importer I wanted to delete my transactions but even after deleting the transactions YNAB still recognised the transactions as being duplicates. If you ever do want to re-import transactions on purpose then just set this to a different value to any previous exports and the `import_ids` will all change!