update CHANGELOG.rst & AUTHORS.rst (#3231)

* finish https://github.com/pyca/cryptography/pull/1973

* change API & add test

Function will now return an instance of EllipticCurvePrivateKey, as that
is the users' ultimate goal anyway.

* fix test

* improve coverage

* complete coverage

* final fix

* centos fix

* try ec.SECT283K1

* try ec.SECT571K1

* try ec.SECT409K1

* try ec.SECT283K1

* try ec.SECT233K1

* try ec.SECT163K1

* try ec.SECT571R1

* try ec.SECT409R1

* try ec.SECT283R1

* try ec.SECT233R1

* try ec.SECT163R2

* try ec.SECP521R1

* try ec.SECP256R1

* retry

* cleanup asserts

* use openssl_assert

* skip unsupported platforms

* change API name to derive_private_key

* change version added

* improve description of `secret` param

* separate successful and failure test cases

* simplify successful case

* add docs for derive_elliptic_curve_public_point

* add period

* update CHANGELOG.rst & AUTHORS.rst

for https://github.com/pyca/cryptography/pull/3225

* added reST prefix

* reduce line length
diff --git a/AUTHORS.rst b/AUTHORS.rst
index 44dec5b..dfa57d7 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -34,3 +34,4 @@
 * Simo Sorce <simo@redhat.com>
 * Thomas Sileo <t@a4.io>
 * Fraser Tweedale <ftweedal@redhat.com>
+* Ofek Lev <ofekmeister@gmail.com> (FFB6 B92B 30B1 7848 546E 9912 972F E913 DAD5 A46E)
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 4a9b88c..1c92ceb 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -38,6 +38,8 @@
   attribute.  When constructed with an iterable of
   :class:`~cryptography.x509.NameAttribute`, each attribute becomes
   a single-valued RDN.
+* Added
+  :func:`~cryptography.hazmat.primitives.asymmetric.ec.derive_private_key`.
 
 1.5.3 - 2016-11-05
 ~~~~~~~~~~~~~~~~~~