docs: update readme

Author: KeJunMao

README.md

@@ -235,41 +235,6 @@ export const MessageDirective = defineDirective<MessageToken, MessageStatement>(
       return `${comment.start} #${node.kind} ${node.value} ${comment.end}`
   },
 }))
-export const MessageDirective = defineDirective<MessageToken, MessageStatement>(context => ({
-  lex(comment) {
-    return simpleMatchToken(comment, /#(error|warning|info)\s*(.*)/)
-  },
-  parse(token) {
-    if (token.type === 'error' || token.type === 'warning' || token.type === 'info') {
-      this.current++
-      return {
-        type: 'MessageStatement',
-        kind: token.type,
-        value: token.value,
-      }
-    }
-  },
-  transform(node) {
-    if (node.type === 'MessageStatement') {
-      switch (node.kind) {
-        case 'error':
-          context.logger.error(node.value, { timestamp: true })
-          break
-        case 'warning':
-          context.logger.warn(node.value, { timestamp: true })
-          break
-        case 'info':
-          context.logger.info(node.value, { timestamp: true })
-          break
-      }
-      return createProgramNode()
-    }
-  },
-  generate(node, comment) {
-    if (node.type === 'MessageStatement' && comment)
-      return `${comment.start} #${node.kind} ${node.value} ${comment.end}`
-  },
-}))
 ```
 
 ### `enforce: 'pre' | 'post'`