Fix typo in README

Author: alexcrichton

README.md

@@ -155,7 +155,7 @@ that can be use programmatically as well:
 | `wasm-tools addr2line` |  |  | Translate wasm offsets to filename/line numbers with DWARF |
 | `wasm-tools completion` |  |  | Generate shell completion scripts for `wasm-tools` |
 | `wasm-tools json-from-wast` |  |  | Convert a `*.wast` file into JSON commands |
-| `wasm-tools -wast` |  |  | Validate the structure of a `*.wast` file |
+| `wasm-tools wast` |  |  | Validate the structure of a `*.wast` file |
 
 [wasmparser]: https://crates.io/crates/wasmparser
 [wat]: https://crates.io/crates/wat