Disable unused serde features

mbrubeck · mbrubeck · commit ebbd78ad982d · 2020-06-05T13:18:40.000-07:00
This makes serde support compatible with no_std.
diff --git a/Cargo.toml b/Cargo.toml
@@ -23,7 +23,7 @@ name = "smallvec"
 path = "lib.rs"
 
 [dependencies]
-serde = { version = "1", optional = true }
+serde = { version = "1", optional = true, default-features = false }
 
 [dev_dependencies]
 bincode = "1.0.1"
