EFCore 3 docs update

Author: borisdj

README.md

@@ -2,8 +2,9 @@
 EntityFrameworkCore extensions: Bulk operations (**Insert, Update, Delete, Read, Upsert, Sync**) and Batch (**Delete, Update**).<br>
 Library is Lightweight and very Efficient, having all mostly used CRUD operation.<br>
 Was selected in top 20 [EF Core Extensions](https://docs.microsoft.com/en-us/ef/core/extensions/) recommended by Microsoft.<br>
-It is targeting NetStandard 2.0 so it can be used on project targeting NetCore(2.0+) or NetFramework(4.6.1+).<br>
-Current version is using EF Core 2.2 and at the moment supports Microsoft SQL Server(2008+) and SQLite.<br>
+It is targeting NetStandard 2.1 so it can be used on project targeting NetCore(3.0+).<br>
+Current version is using EF Core 3 and at the moment supports Microsoft SQL Server(2008+) and SQLite.<br>
+Versions before 3.0, last being 2.6.3, are targeting NetStandard 2.0 and can be used with NetCore(2.0+) or NetFramework(4.6.1+).<br>
 EFCore/v.Nuget: EFCore2.1/v2.4.1 EFCore2.0/v2.0.8, and for EF Core 1.x use 1.1.0 (targeting NetStandard 1.4)<br>
 Under the hood uses [SqlBulkCopy](https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlbulkcopy.aspx) for Insert, for Update/Delete combines BulkInsert with raw Sql [MERGE](https://docs.microsoft.com/en-us/sql/t-sql/statements/merge-transact-sql).<br>
 For SQLite there is no BulkCopy, instead library uses plain SQL combined with [UPSERT](https://www.sqlite.org/lang_UPSERT.html).<br>
@@ -43,7 +44,12 @@ context.Items.Where(a => a.ItemId >  500).BatchDeleteAsync();
 
 // Update (using Expression arg.) supports Increment/Decrement 
 context.Items.Where(a => a.ItemId <= 500).BatchUpdate(a => new Item { Quantity = a.Quantity + 100 });
-  // can be as value '+100' or as variable '+incrementStep'(int incrementStep = 100;)
+  // can be as value '+100' or as variable '+incrementStep' (int incrementStep = 100;)
+// IMPORTANT: When using parameterized Query BatchOperation currently requires argument 'parametersDict'
+int itemId = 500;
+var parametersDict = new Dictionary<string, object> { { nameof(itemId), itemId } };
+var query = context.Items.Where(a => a.ItemId <= itemId);
+query.BatchUpdate(a => new Item { Quantity = a.Quantity + 100 }, parametersDict);
 
 // Update (via simple object)
 context.Items.Where(a => a.ItemId <= 500).BatchUpdate(new Item { Description = "Updated" });