Enable dependency features for map order preservation

Author: David Orchard

Cargo.toml

@@ -28,12 +28,12 @@ lazy_static = "1.0"
 serde = "1.0.8"
 nom = "6"
 
-toml = { version = "0.5", optional = true }
-serde_json = { version = "1.0.2", optional = true }
+toml = { version = "0.5", features = ["preserve_order"], optional = true }
+serde_json = { version = "1.0.2", features = ["std", "preserve_order"], optional = true }
 yaml-rust = { version = "0.4", optional = true }
 serde-hjson = { version = "0.9", default-features = false, optional = true }
 rust-ini = { version = "0.17", optional = true }
-ron = { version = "0.6", optional = true }
+ron = { version = "0.6", features = ["indexmap"], optional = true }
 json5_rs = { version = "0.3", optional = true, package = "json5" }
 linked-hash-map = { version = "0.5.4", features = ["serde_impl"] }