fix!: update to latest ordered-float (#503)

Cargo.toml

@@ -37,7 +37,7 @@ serde_derive = "1.0"
 approx = ">=0.3, <0.6"
 custom_derive = "0.1"
 newtype_derive = "0.1"
-ordered-float = "2.0"
+ordered-float = "3.1"
 regex = { version = "1.3", default-features = false, features = ["std", "perf"] }
 multimap = ">=0.6, <0.9"
 fxhash = "0.2"