news for release 0.28.3

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+[[!meta date="2019-03-05"]]
+
+Notmuch 0.28.3 (2019-03-05)
+===========================
+
+Library
+-------
+
+Fix a bug with the internal data structure `_notmuch_string_map_t` used
+by message properties.
+
+Build System
+------------
+
+Serialize calls to sphinx-build to avoid race condition.