Future is not send.

src/command/build/runner.rs

@@ -61,7 +61,7 @@ async fn get_output_directory(config: &Config) -> Result<PathBuf, CustomError> {
     Ok(output_directory)
 }
 
-fn filter_to_post_directories(entry: &DirEntry) -> Result<bool, CustomError> {
+async fn filter_to_post_directories(entry: &DirEntry) -> Result<bool, CustomError> {
     Ok(true)
 }