fix: tokio postgres crate features

Author: samparsky

primitives/Cargo.toml

@@ -39,7 +39,7 @@ rand = { version = "^0.6" }
 # postgres feature
 postgres-types = {version = "0.1.0-alpha.1", optional = true}
 bytes = { version = "0.4.12", optional = true}
-tokio-postgres = {version = "0.5.0-alpha.1", optional = true}
+tokio-postgres = {version = "0.5.0-alpha.1", optional = true, features = ["with-chrono-0_4", "with-serde_json-1"]}
 
 # Other
 lazy_static = "1.4.0"