PR #191 broke the build

[steveej]

0587702 introduced code which doesn't compile here, saying

error[E0599]: no method named `and_then` found for type `wasi_common::WasiCtxBuilder` in the current scope
   --> wasmtime-wasi/src/instantiate.rs:105:10
    |
105 |         .and_then(|ctx| ctx.inherit_stdio())
    |          ^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.
error: Could not compile `wasmtime-wasi`.

[yurydelendik]

There is older version of wasi-common in the cargo cache. Not sure how to reset it properly, but cargo update worked.