lint issues

There are some lint issues, are those expected?

```
deno lint
error[no-explicit-any]: `any` type is not allowed
--> /workspaces/deno-chat-ws/ChatServer.ts:4:49
|
4 | type AppEvent = { event: string; [key: string]: any };
| ^^^
= hint: Use a specific type other than `any`

docs: https://docs.deno.com/lint/rules/no-explicit-any

error[no-explicit-any]: `any` type is not allowed
--> /workspaces/deno-chat-ws/ChatServer.ts:31:43
|
31 | private send(username: string, message: any) {
| ^^^
= hint: Use a specific type other than `any`

docs: https://docs.deno.com/lint/rules/no-explicit-any

Found 2 problems
Checked 3 files
```