Update CHANGELOG for jpadilla#624. (jpadilla#635)

Author: dajiaji

CHANGELOG.rst

@@ -16,6 +16,8 @@ Fixed
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 - Remove padding from JWK test data. `#628 <https://github.com/jpadilla/pyjwt/pull/628>`__
+- Make `kty` mandatory in JWK to be compliant with RFC7517. `#624 <https://github.com/jpadilla/pyjwt/pull/624>`__
+- Allow JWK without `alg` to be compliant with RFC7517. `#624 <https://github.com/jpadilla/pyjwt/pull/624>`__
 
 Added
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