port changelog for 2.1.4 to master (#4031)

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 72d5609..5a256a2 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -12,6 +12,13 @@
 * Added token rotation support to :doc:`Fernet </fernet>` with
   :meth:`~cryptography.fernet.MultiFernet.rotate`.
 
+.. _v2-1-4:
+
+2.1.4 - 2017-11-29
+~~~~~~~~~~~~~~~~~~
+
+* Added ``X509_up_ref`` for an upcoming ``pyOpenSSL`` release.
+
 .. _v2-1-3:
 
 2.1.3 - 2017-11-02