Move 'nth' into 'select' (#4385)

crates/nu-command/tests/commands/parse.rs

@@ -25,7 +25,7 @@ mod simple {
                     open key_value_separated_arepa_ingredients.txt
                     | lines
                     | each { echo $it | parse "{Name}={Value}" }
-                    | nth 1
+                    | select 1
                     | get Value
                 "#
             ));