gost94: use digest::Output in macros (#154)

For consistency, per #153

Author: tarcieri

gost94/src/macros.rs

@@ -1,8 +1,6 @@
 macro_rules! gost94_impl {
     ($state:ident, $sbox:expr) => {
-        use digest::impl_write;
-        use digest::{consts::U32, generic_array::GenericArray};
-        use digest::{BlockInput, FixedOutputDirty, Reset, Update};
+        use digest::{consts::U32, impl_write, BlockInput, FixedOutputDirty, Reset, Update};
         use $crate::gost94::{Block, Gost94, SBox};
 
         /// GOST94 state
@@ -33,7 +31,7 @@ macro_rules! gost94_impl {
         impl FixedOutputDirty for $state {
             type OutputSize = U32;
 
-            fn finalize_into_dirty(&mut self, out: &mut GenericArray<u8, U32>) {
+            fn finalize_into_dirty(&mut self, out: &mut digest::Output<Self>) {
                 self.sh.finalize_into_dirty(out)
             }
         }