Fix misspelled user name in History.md.

History.md

@@ -4,7 +4,7 @@ Dalli Changelog
 2.6.0
 =======
 
-- Add lambda support for cache namespaces [josh.w.lewis, #311]
+- Add lambda support for cache namespaces [joshwlewis, #311]
 - read_multi optimization, now checks local_cache [chendo, #306]
 - Re-implement get_multi to be non-blocking [tmm1, #295]
 - Add `dalli` accessor to dalli_store to access the underlying