Merge pull request #251 from dtolnay/skipcargofeatures

Omit cargo-features from generated Cargo.toml if empty

src/manifest.rs

@@ -7,7 +7,7 @@ use std::path::PathBuf;
 
 #[derive(Serialize, Debug)]
 pub struct Manifest {
-    #[serde(rename = "cargo-features")]
+    #[serde(rename = "cargo-features", skip_serializing_if = "Vec::is_empty")]
     pub cargo_features: Vec<String>,
     pub package: Package,
     #[serde(skip_serializing_if = "Map::is_empty")]