[doc] add release date

[ci skip]
markovmodel · Jul 20, 2018 · 122a38c · 122a38c
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commit 122a38c
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/doc/source/CHANGELOG.rst b/doc/source/CHANGELOG.rst
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 Changelog
 =========
 
-2.5.4 (??-??-???)
------------------
+2.5.4 (07-20-2018)
+------------------
 
 **New features**: