Update NEWS, fix style.

NEWS

@@ -5,6 +5,10 @@
   * Add a `dulwich.archive` module that can create tarballs.
     Based on code from Jonas Haag in klaus.
 
+  * Fix handling of ambiguous refs in `parse_ref` to make
+    it match the behaviour described in https://git-scm.com/docs/gitrevisions.
+    (Chris Bunney)
+
  BUG FIXES
 
   * Simplify handling of SSH command invocation.

dulwich/objectspec.py

@@ -52,7 +52,7 @@ def parse_ref(container, refspec):
         b"refs/tags/" + refspec,
         b"refs/heads/" + refspec,
         b"refs/remotes/" + refspec,
-        b"refs/remotes/"+refspec+b"/HEAD"
+        b"refs/remotes/" + refspec + b"/HEAD"
     ]
     for ref in possible_refs:
         if ref in container: