Include LICENSE file (#303)

This is needed by the MIT license terms

```
❯ cargo package --list | grep LICENSE
LICENSE
```

Signed-off-by: Michel Lind <salimma@fedoraproject.org>

Cargo.toml

@@ -16,6 +16,7 @@ autoexamples = false
 
 build = "bindings/rust/build.rs"
 include = [
+  "LICENSE",
   "bindings/rust/*",
   "./grammar.js",
   "queries/*",