Re-export the chrono crate from taskchampion.

The chrono types are central to use of TC, so this will help consumers
of the TC crate to avoid dependency conflicts.

integration-tests/Cargo.toml

@@ -7,7 +7,6 @@ publish = false
 build = "build.rs"
 
 [dependencies]
-chrono = { version = "^0.4.10", features = ["serde"] }
 taskchampion = { path = "../taskchampion" }
 taskchampion-sync-server = { path = "../sync-server" }
 

integration-tests/tests/update-and-delete-sync.rs

@@ -1,4 +1,4 @@
-use chrono::{TimeZone, Utc};
+use taskchampion::chrono::{TimeZone, Utc};
 use taskchampion::{Replica, ServerConfig, Status, StorageConfig};
 use tempfile::TempDir;