Update README.md

Author: ota-meshi

README.md

@@ -63,7 +63,7 @@ If not specified, all syntaxes that express static values ​​are accepted. Fo
 
 - [AST.md](./docs/AST.md) is AST specification.
 - [no-template-literals.ts](https://github.com/ota-meshi/eslint-plugin-jsonc/blob/master/lib/rules/no-template-literals.ts) is an example.
-- You can see the AST on the [DEMO](https://ota-meshi.github.io/jsonc-eslint-parser/).
+- You can see the AST on the [Online DEMO](https://ota-meshi.github.io/jsonc-eslint-parser/).
 
 ## :lock: License