message: doc(readme) Fix a typo.
  This patch fixes a typo in the C example.
diff: @@ -73,7 +73,7 @@ int main()
  argument_one.tag = WASM_I32;
  argument_one.value.I32 = 7;
  - // Value of argumen #2 is `8i32`.
  + // Value of argument #2 is `8i32`.
  wasmer_value_t argument_two;
  argument_two.tag = WASM_I32;
  argument_two.value.I32 = 8;
  