feat(cube): support postgres cube

sqlx-postgres/src/copy.rs

@@ -216,7 +216,7 @@ impl<C: DerefMut<Target = PgConnection>> PgCopyIn<C> {
             let buf = conn.stream.write_buffer_mut();
 
             // Write the CopyData format code and reserve space for the length.
-            // This may end up sending an empty `CopyData` packet if, after this point, 
+            // This may end up sending an empty `CopyData` packet if, after this point,
             // we get canceled or read 0 bytes, but that should be fine.
             buf.put_slice(b"d\0\0\0\x04");
 

sqlx-postgres/src/type_checking.rs

@@ -30,6 +30,8 @@ impl_type_checking!(
 
         sqlx::postgres::types::PgLQuery,
 
+        sqlx::postgres::types::PgCube,
+
         #[cfg(feature = "uuid")]
         sqlx::types::Uuid,