Remove serde_derive from the dependencies.

Cargo.toml

@@ -21,5 +21,4 @@ include = ["Cargo.toml", "README.md", "LICENSE", "ACKNOWLEDGEMENTS", "src/**/*.r
 [dependencies]
 ironsea_index = "^0.1"
 
-serde = "^1.0"
-serde_derive = "^1.0"
+serde = { version = "^1.0", features = ["derive"] }

src/destructured.rs

@@ -6,6 +6,8 @@ use std::hash::Hash;
 use ironsea_index::IndexedDestructured;
 use ironsea_index::Record;
 use ironsea_index::RecordFields;
+use serde::Deserialize;
+use serde::Serialize;
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct Index<F, K>

src/full_record.rs

@@ -6,6 +6,8 @@ use std::iter::Iterator;
 
 use ironsea_index::Indexed;
 use ironsea_index::Record;
+use serde::Deserialize;
+use serde::Serialize;
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct Index<R, K>

src/lib.rs

@@ -1,6 +1,3 @@
-#[macro_use]
-extern crate serde_derive;
-
 mod destructured;
 mod full_record;