feat(rundir): Add AsRef<Path> trait implementation

src/rundir.rs

@@ -213,6 +213,12 @@ impl RunDir {
     }
 }
 
+impl AsRef<Path> for RunDir {
+    fn as_ref(&self) -> &Path {
+        &self.path
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::{RunDir, RunDirError};