Update to latest enacle with updated API

rebar.config

@@ -12,7 +12,7 @@
 
         %% This is used just in one place, just to get blake2b_256 hash.
         {enacl, {git, "https://github.com/aeternity/enacl.git",
-                {ref, "26180f4"}}}
+                {ref, "793ddb5"}}}
        ]}.
 
 {plugins, [{rebar_aecuckooprebuilt_dep, {git, "https://github.com/aeternity/rebar3-cuckoo-prebuilt-plugin.git",

rebar.lock

@@ -10,7 +10,7 @@
   0},
  {<<"enacl">>,
   {git,"https://github.com/aeternity/enacl.git",
-      {ref,"26180f42c0b3a450905d2efd8bc7fd5fd9cece75"}},
+      {ref,"793ddb502f7fe081302e1c42227dca70b09f8e17"}},
   0},
  {<<"hut">>,{pkg,<<"hut">>,<<"1.3.0">>},0}]}.
 [

src/aeminer_blake2b_256.erl

@@ -14,6 +14,5 @@
 
 -spec hash(hashable()) -> hash().
 hash(Bin) ->
-    {ok, Hash} = enacl:generichash(?HASH_BYTES_SIZE, Bin),
-    Hash.
+    enacl:generichash(?HASH_BYTES_SIZE, Bin).