bugfix: single-argument export was borked

[Aaron Bentley]

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Hi Martin,
Here's a fix for a bug I found in single-arg export.

Aaron

abentley at lappy:~/bzr.dev2$ bzr diff
*** modified file 'bzrlib/commands.py'
- --- bzrlib/commands.py
+++ bzrlib/commands.py
@@ -541,7 +541,7 @@
     def run(self, dest, revno=None):
         b = Branch('.')
         if revno == None:
- -            rh = b.revision_history[-1]
+            rh = b.revision_history()[-1]
         else:
             rh = b.lookup_revision(int(revno))
         t = b.revision_tree(rh)
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