Update CHANGELOG

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+libuecc v7 (unreleased)
+
+* Change conversion between Ed25519 and legacy representation. This should
+    not affect any operations unless Ed25519 and legacy load/store
+    functions are mixed when accessing a work structure. Doing so is now
+    officially supported, for example to convert a legacy public key to
+    Ed25519 format.
+* The changed representation allows to use the same
+    ecc_25519_work_default_base for both Ed25519 and legacy.
+    ecc_25519_work_default_base and ecc_25519_scalarmult_base have been
+    undeprecated, ecc_25519_work_base_ed25519 and
+    ecc_25519_work_base_legacy are deprecated now.
+* All points are now internally represented with Ed25519 coordinates, which
+    allows about 6% faster scalar multplication than the legacy
+    representation.
+* ecc_25519_scalarmult_base has been further optimized, making it another
+    6% faster than normal ecc_25519_scalarmult.
+
+
 libuecc v6 (2015/10/25)
 
 * Fixes a bug which might have caused a point's y coordinate to be negated