Fix #99: expose file::source::FileSource

Signed-off-by: Matthias Beyer <[email protected]>

Author: Chen Rotem Levy

src/lib.rs

@@ -37,6 +37,7 @@ pub use crate::builder::{AsyncConfigBuilder, ConfigBuilder};
 pub use crate::config::Config;
 pub use crate::env::Environment;
 pub use crate::error::ConfigError;
+pub use crate::file::source::FileSource;
 pub use crate::file::{File, FileFormat, FileSourceFile, FileSourceString, FileStoredFormat};
 pub use crate::format::Format;
 pub use crate::map::Map;