Add missing quotes to example code

[m-allanson]

Using this example will result in an error:

node_modules/.bin/toast incremental .
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error: Unexpected token `preact`. Expected a string literal
 --> </>:1:19
  |
1 | import { h } from preact;
  |                   ^^^^^^

The application panicked (crashed).
Message:  called `Result::unwrap()` on an `Err` value: failed to parse module
Location: toast/src/swc_ops.rs:52

Backtrace omitted.
Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.

Adding the quotes fixes it.

[ChristopherBiscardi]

Thank you!!

[m-allanson]

No problem!