Update go.mod

Support Go 1.20 with Tinygo

Merge pull request syumai#72 from syumai/update-to-go-1-21

update to Go 1.21

Merge pull request syumai#61 from aki-0421/fetch

Add redirect mode in Fetch

Merge pull request syumai#60 from syumai/ignore-closed-pipe-error

ignore io.ErrClosedPipe

Merge pull request syumai#46 from syumai/move-cron-into-cloudflare

move cron into cloudflare

Merge pull request syumai#41 from syumai/add-workers-gen-go-command

add workers-assets-gen command to generate JS code automatically

Merge pull request syumai#38 from aki-0421/cache

Add Cache API

Merge pull request syumai#36 from aki-0421/fetch-event

Full support for FetchEvent

Merge pull request syumai#33 from syumai/add-discord-server

add description about Discord server and badge to README