Log spam: "command module exporting '__data_end' is deprecated"

Every time I run a rust binary (compiled to `wasm32-wasi`) with the `wasmtime` crate, I get the following message:

```
[2021-01-20T23:19:56Z WARN wasmtime::linker] command module exporting '__data_end' is deprecated
[2021-01-20T23:19:56Z WARN wasmtime::linker] command module exporting '__heap_base' is deprecated
```

It seems to be harmless, but it's quite noisy.

Is there a problem with how I'm building my binary?

```
cargo build --target wasm32-wasi --release --bin logic
```