Make round module public

(so we don't need to show it in the main documentation)

src/lib.rs

@@ -532,7 +532,7 @@ pub use offset::LocalResult;
 #[doc(inline)]
 pub use offset::{FixedOffset, Offset, TimeZone, Utc};
 
-mod round;
+pub mod round;
 pub use round::{DurationRound, RoundingError, SubsecRound};
 
 mod weekday;

src/round.rs

@@ -1,6 +1,8 @@
 // This is a part of Chrono.
 // See README.md and LICENSE.txt for details.
 
+//! Functionality for rounding or truncating a `DateTime` by a `Duration`.
+
 use crate::datetime::DateTime;
 use crate::duration::Duration;
 use crate::NaiveDateTime;