Add newline to end of file

Inline with UNIX convention add a trailing newline to file.

Author: tcharding

secp256k1-sys/src/recovery.rs

@@ -169,4 +169,4 @@ mod fuzz_dummy {
 }
 
 #[cfg(fuzzing)]
-pub use self::fuzz_dummy::*;
+pub use self::fuzz_dummy::*;