docs: remove likely unnecessary html_root_url attribute

Author: Iizuki

src/lib.rs

@@ -14,7 +14,6 @@
 //! - `test-util`: Exposes utilities for testing streams, in particular:
 //!   - [`delay_items`](crate::test_util::delay_items)
 //!   - [`record_delay`](crate::StreamTools::record_delay)
-#![doc(html_root_url = "https://docs.rs/streamtools/0.7.6/")]
 
 use either_or_both::EitherOrBoth;
 use futures::{Stream, TryStream, stream::Map};