Fix pin-project issues

See taiki-e/pin-project-lite#33

Author: yoshuawuyts

src/lib.rs

@@ -31,9 +31,8 @@
 //! - [SSE Spec](https://html.spec.whatwg.org/multipage/server-sent-events.html#concept-event-stream-last-event-id)
 //! - [EventSource web platform tests](https://github.com/web-platform-tests/wpt/tree/master/eventsource)
 
-#![forbid(rust_2018_idioms)]
 #![deny(missing_debug_implementations, nonstandard_style)]
-#![warn(missing_docs, missing_doc_code_examples, unreachable_pub)]
+#![warn(missing_docs, rust_2018_idioms, unreachable_pub)]
 
 mod decoder;
 mod encoder;