Update changelog

Change-Id: Ib284990fd819c71411617c3d995178181af9fc4d

docs/source/version_history.rst

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 Bug Fixes & Minor Changes
 -------------------------
+#. Fix missing gflags imported target definition in
+   CeresConfig.cmake. (Alex Stewart)
 #. Make gflags a public dependency of Ceres if it and glog are
    found. (Alex Stewart)
 #. Add support for glog exported CMake target. (Alex Stewart)