fix: revert wretch export (#31)

Author: roccomuso

index.js

@@ -5,6 +5,5 @@
 const fetch = require('./fetch')
 const WebSocket = require('./websocket')
 const fetchival = require('./fetchival')
-const wretch = require('./wretch')
 
-module.exports = { fetch, WebSocket, fetchival, wretch }
+module.exports = { fetch, WebSocket, fetchival }