Drop time/nested-values feature

It is not needed thanks to PR #30

Author: Techcable

Cargo.toml

@@ -29,7 +29,7 @@ slog = { version = "2.1.1" }
 serde_json = "1"
 serde = "1"
 erased-serde = {version = "0.3", optional = true }
-time = { version = "0.3.6", features = ["formatting", "local-offset"] }
+time = { version = "0.3.6", features = ["formatting"] }
 
 [dev-dependencies]
 slog-async = "2"