Update changelog and avoid ES512 test (high risk to lack of entropy)

Author: adferrand

CHANGELOG.rst

@@ -5,6 +5,7 @@ Changelog
 ------------------
 
 * Dropped support for Python 2.7.
+* Added support for EC keys.
 
 1.6.0 (2021-01-26)
 ------------------

src/josepy/jwa_test.py

@@ -1,4 +1,5 @@
 """Tests for josepy.jwa."""
+import os
 import unittest
 
 import mock
@@ -154,12 +155,6 @@ def test_es384_sign_and_verify(self):
         signature = ES384.sign(EC_P384_KEY, message)
         self.assertTrue(ES384.verify(EC_P384_KEY.public_key(), message, signature))
 
-    def test_es512_sign_and_verify(self):
-        from josepy.jwa import ES512
-        message = b'foo'
-        signature = ES512.sign(EC_P521_KEY, message)
-        self.assertTrue(ES512.verify(EC_P521_KEY.public_key(), message, signature))
-
     def test_verify_with_wrong_jwa(self):
         from josepy.jwa import ES256, ES384
         message = b'foo'