do not request oldtime feature from chrono package
this removes the dependency on the old (unsupported) version of time
@@ -53,7 +53,7 @@ fast_chemail = "0.9.6"
# Feature optional dependencies
bson = { version = "2.0.0", optional = true, features = ["chrono-0_4"] }
-chrono = { version = "0.4.19", optional = true }
+chrono = { version = "0.4.19", optional = true, default-features = false, features = ["clock", "std"] }
chrono-tz = { version = "0.5.3", optional = true }
hashbrown = { version = "0.12.0", optional = true }
iso8601-duration = { version = "0.1.0", optional = true }
