update to 2018 edition (#141)

* update to 2018 edition

* remove more externs

* bump version

1 files changed, 1 insertions, 0 deletions

diff --git a/src/rep.rs b/src/rep.rs
index 5317d83..097ae9e 100644
--- a/src/rep.rs
+++ b/src/rep.rs
@@ -1,5 +1,6 @@
 //! Rust representations of docker json structures
 
+use serde_derive::{Deserialize, Serialize};
 use std::collections::HashMap;
 
 #[derive(Clone, Debug, Serialize, Deserialize)]