Update serde_test dependency

sugar700 · web-flow · commit d17db497a9f1 · 2017-09-29T21:45:09.000+02:00
diff --git a/enum-map/Cargo.toml b/enum-map/Cargo.toml
@@ -19,7 +19,7 @@ serde = { version = "1.0.0", optional = true, features = ["derive"] }
 enum-map-derive = { version = "0.2.4", path = "../enum-map-derive" }
 
 [dev-dependencies]
-serde_test = "1.0.5"
+serde_test = "1.0.15"
 serde_json = "1.0.2"
 
 [package.metadata.docs.rs]
