update shipment rate

lib/pages/shipment_editor.dart

@@ -157,6 +157,24 @@ class _ShipmentEditorState extends State<ShipmentEditor> {
     var shipmentModel = Provider.of<ShipmentModel>(context);
     MainModel mainModel = Provider.of<MainModel>(context);
 
+    final cargoBtn = Container(
+      padding: EdgeInsets.only(top: 5),
+      child: Align(
+          alignment: Alignment.bottomCenter,
+          child: Center(
+              child: Container(
+            width: 250,
+            child: FlatButton(
+              child: Text('Download Cargo Manifest'),
+              color: primaryColor,
+              textColor: Colors.white,
+              onPressed: () {
+                Navigator.pop(context);
+              },
+            ),
+          ))),
+    );
+
     final commercialBtn = Container(
       padding: EdgeInsets.only(top: 20),
       child: Align(
@@ -296,7 +314,7 @@ class _ShipmentEditorState extends State<ShipmentEditor> {
                   Container(
                     padding:
                         EdgeInsets.only(top: widget.shipment == null ? 5 : 0),
-                    child: fcsInput('Arrival Date', Icons.date_range,
+                    child: fcsInput('ETA', Icons.date_range,
                         controller: _arrivalDateController),
                   ),
                   Container(
@@ -378,6 +396,7 @@ class _ShipmentEditorState extends State<ShipmentEditor> {
                   widget.shipment == null ? Container() : commercialBtn,
                   widget.shipment == null ? Container() : packingBtn,
                   widget.shipment == null ? Container() : dmsBtn,
+                  widget.shipment == null ? Container() : cargoBtn,
                   widget.shipment == null ? createBtn : updateBtn,
                   SizedBox(height: 15)
                 ]),