Update CHANGELOG for #6605

CHANGELOG.md

@@ -1,4 +1,26 @@
 ## 1.49.0 (Unreleased)
+
+FEATURES
+
+* **New Data Source:** `aws_ec2_transit_gateway` [GH-6605]
+* **New Data Source:** `aws_ec2_transit_gateway_route_table` [GH-6605]
+* **New Data Source:** `aws_ec2_transit_gateway_vpc_attachment` [GH-6605]
+* **New Resource:** `aws_ec2_transit_gateway` [GH-6605]
+* **New Resource:** `aws_ec2_transit_gateway_route` [GH-6605]
+* **New Resource:** `aws_ec2_transit_gateway_route_table` [GH-6605]
+* **New Resource:** `aws_ec2_transit_gateway_route_table_association` [GH-6605]
+* **New Resource:** `aws_ec2_transit_gateway_route_table_propagation` [GH-6605]
+* **New Resource:** `aws_ec2_transit_gateway_vpc_attachment` [GH-6605]
+
+ENHANCEMENTS
+
+* data-source/aws_route: Add `transit_gateway_id` attribute [GH-6605]
+* data-source/aws_route_table: Add `route` attribute block `transit_gateway_id` attribute [GH-6605]
+* resource/aws_default_route_table: Add `route` configuration block `transit_gateway_id` argument [GH-6605]
+* resource/aws_route: Add `transit_gateway_id` argument [GH-6605]
+* resource/aws_route_table: Add `route` configuration block `transit_gateway_id` argument [GH-6605]
+* resource/aws_vpn_connection: Add `transit_gateway_id` argument, mark `vpn_gateway_id` as optional [GH-6605]
+
 ## 1.48.0 (November 26, 2018)
 
 FEATURES