Revert "refactor(lib): Switch from pin-project to pin-project-lite"

This reverts commit 43412a950f.

src/proto/h2/mod.rs

@@ -5,7 +5,7 @@ use http::header::{
     TRANSFER_ENCODING, UPGRADE,
 };
 use http::HeaderMap;
-use pin_project_lite::pin_project;
+use pin_project::pin_project;
 use std::error::Error as StdError;
 use std::io::IoSlice;
 
@@ -94,16 +94,15 @@ fn decode_content_length(headers: &HeaderMap) -> DecodedLength {
 
 // body adapters used by both Client and Server
 
-pin_project! {
-    struct PipeToSendStream<S>
-    where
-        S: HttpBody,
-    {
-        body_tx: SendStream<SendBuf<S::Data>>,
-        data_done: bool,
-        #[pin]
-        stream: S,
-    }
+#[pin_project]
+struct PipeToSendStream<S>
+where
+    S: HttpBody,
+{
+    body_tx: SendStream<SendBuf<S::Data>>,
+    data_done: bool,
+    #[pin]
+    stream: S,
 }
 
 impl<S> PipeToSendStream<S>