Fix wasm-smith README validate.rs URL (#1186)

Author: njelich

crates/wasm-smith/README.md

@@ -76,7 +76,7 @@ $ cargo fuzz run my_wasm_smith_fuzz_target
 ```
 
 > **Note:** Also check out [the `validate` fuzz
-> target](https://github.com/fitzgen/wasm-smith/blob/main/fuzz/fuzz_targets/validate.rs)
+> target](https://github.com/bytecodealliance/wasm-tools/blob/main/fuzz/fuzz_targets/validate.rs)
 > defined in this repository. Using the `wasmparser` crate, it checks that every
 > module generated by `wasm-smith` validates successfully.