Set release date for 1.4.0

oschwald · oschwald · commit 2a31533bb054 · 2018-05-25T12:56:04.000-07:00
diff --git a/HISTORY.rst b/HISTORY.rst
@@ -3,7 +3,7 @@
 History
 -------
 
-1.4.0
+1.4.0 (2018-05-25)
 ++++++++++++++++++
 
 * IMPORTANT: Previously, the pure Python reader would allow
