Enable the rend feature of rkyv

Fixes #137.

Author: mbrubeck

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name        = "ordered-float"
-version     = "3.9.0"
+version     = "3.9.1"
 authors     = [
   "Jonathan Reem <[email protected]>",
   "Matt Brubeck <[email protected]>",
@@ -16,7 +16,7 @@ edition     = "2021"
 [dependencies]
 num-traits = { version = "0.2.1", default-features = false }
 serde      = { version = "1.0", optional = true, default-features = false }
-rkyv       = { version = "0.7.41", optional = true, default-features = false }
+rkyv       = { version = "0.7.41", optional = true, default-features = false, features = ["rend"] }
 schemars   = { version = "0.8.8", optional = true }
 rand       = { version = "0.8.3", optional = true, default-features = false }
 arbitrary  = { version = "1.0.0", optional = true }