docs(readme): update for Deno and Bun

Author: yusukebe

README.md

@@ -21,22 +21,46 @@ npm i -D @cloudflare/workers-types
 yarn add -D @cloudflare/workers-types
 ```
 
-## Write your code
+## Example
 
 ```ts
 // index.ts
 import { Pico } from '@picojs/pico'
 
+// create Pico instance
 const app = new Pico()
 
+// handle GET request and return TEXT response
 app.get('/', () => 'Hello Pico!')
-app.get('/entry/:id', ({ pathname }) => {
+
+// capture the path parameter and return JSON response
+app.post('/entry/:id', ({ pathname }) => {
   const { id } = pathname.groups
   return {
     'your id is': id,
   }
 })
 
+// get the query parameter
+app.get('/search', ({ search }) => {
+  const params = new URLSearchParams(search.input)
+  return `Your query is ${params.get('q')}`
+})
+
+// handle the PURGE method and return Redirect response
+app.on('PURGE', '/cache', () => {
+  return new Response(null, {
+    status: 302,
+    headers: {
+      Location: '/',
+    },
+  })
+})
+
+// return custom 404 response
+app.all('*', () => new Response('Custom 404', { status: 404 })
+
+// export app for Cloudflare Workers
 export default app
 ```
 
@@ -52,6 +76,26 @@ wrangler dev index.ts
 wrangler publish index.ts
 ```
 
+## Bun
+
+Now, Pico does not work on Bun because URLPattern may not be implemented yet.
+
+## Deno
+
+```ts
+import { serve } from 'https://deno.land/std/http/server.ts'
+import { Pico } from 'https://esm.sh/@picojs/pico'
+
+const app = new Pico()
+app.get('/', () => 'Hi Deno!')
+
+serve(app.fetch)
+```
+
+```
+deno run -A pico.ts
+```
+
 ## Q&A
 
 > What's the difference from Hono?

src/pico.ts

@@ -46,7 +46,7 @@ class Pico extends defineDynamicClass() {
 
   notFound = () => new Response('Not Found', { status: 404 })
 
-  fetch(request: Request) {
+  fetch = (request: Request) => {
     const match = this.match(request.method, request.url)
     if (match === undefined) return this.notFound()
     const response = match.handler({ request, ...match.result })