[minor] Fewer warnings

src/lib.rs

@@ -8,7 +8,7 @@
 //! A `Provider` abstracts these two sources by merging them together into one virtual source. \
 //! It also handles synchronisation between the local cache and the server.
 
-mod calendar;
+pub mod calendar;
 pub use calendar::Calendar;
 mod task;
 pub use task::Task;