bug in dynamic_load_balance example

[blueeyezhy]

Bug Report

src/dynamic_load_balance/client.rs:2:32

|
2 | use tonic::transport::channel::Change;
| ^^^^^^ private enum
|
note: the enum Change is defined here
--> /tonic-0.12.3/src/transport/channel/mod.rs:33:16
-->

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