Remove unneeded whitespace

One line of whitespace is customary, remove additional unneeded lines of whitespace.

Author: tcharding

src/ecdh.rs

@@ -47,13 +47,11 @@ pub struct SharedSecret {
 }
 impl_raw_debug!(SharedSecret);
 
-
 // This implementes `From<N>` for all `[u8; N]` arrays from 128bits(16 byte) to 2048bits allowing known hash lengths.
 // Lower than 128 bits isn't resistant to collisions any more.
 impl_from_array_len!(SharedSecret, 256, (16 20 28 32 48 64 96 128 256));
 
 impl SharedSecret {
-
     /// Create an empty SharedSecret
     pub(crate) fn empty() ->  SharedSecret {
         SharedSecret {