kebab-case dockerfile config

Author: Emilgardis

Diff for: src/cross_toml.rs

@@ -42,6 +42,7 @@ pub struct CrossTargetConfig {
 
 /// Dockerfile configuration
 #[derive(Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "kebab-case")]
 pub struct CrossTargetConfigDockerfile {
     file: String,
     context: Option<String>,