docs(README): fix example to use deno.land instead of denopkg.com (#157)

README.md

@@ -13,7 +13,7 @@ needs `--allow-net` privilege
 **Stateless Commands**
 
 ```ts
-import { connect } from "https://denopkg.com/keroxp/deno-redis/mod.ts";
+import { connect } from "https://deno.land/x/redis/mod.ts";
 const redis = await connect({
   hostname: "127.0.0.1",
   port: 6379