update CHANGES

     [Emilia Käsper]

  *) Add X25519 support.

     Integrate support for X25519 into EC library. This includes support

     Add ASN.1 and EVP_PKEY methods for X25519. This includes support

     for public and private key encoding using the format documented in

     draft-josefsson-pkix-newcurves-01: specifically X25519 uses the

     OID from that draft, encodes public keys using little endian

     format in the ECPoint structure and private keys using

     little endian form in the privateKey field of the ECPrivateKey

     structure. TLS support complies with draft-ietf-tls-rfc4492bis-06

     and uses X25519(29).

     Note: the current version supports key generation, public and

     private key encoding and ECDH key agreement using the EC API.

     Low level point operations such as EC_POINT_add(), EC_POINT_mul()

     are NOT supported.

     draft-ietf-curdle-pkix-02. The coresponding EVP_PKEY method supports

     key generation and key derivation.

     TLS support complies with draft-ietf-tls-rfc4492bis-08 and uses

     X25519(29).

     [Steve Henson]

  *) Deprecate SRP_VBASE_get_by_user.