Tweak wording

README.md

@@ -104,7 +104,7 @@ Creates a deep copy of `a`, which must be a valid JSON object/array/value.
 
 **NOTE:** In jiff <= 0.6.x, `jiff.clone` incorrectly caused some ISO Date-formatted strings (eg `"2014-12-03T11:40:16.816Z"`) to be turned into `Date` objects.  Thus, a clone *might not end up as an exact copy*.
 
-That was fixed in 0.7.0: `jiff.clone` creates exact copies.
+As of 0.7.0 `jiff.clone` creates exact copies.
 
 If you have code that depended on that hidden deserialization, *it will break*.  Date deserialization is now the responsibility of the party who parsed the JSON string from which the original object/array/etc. (ie, the one passed to `jiff.clone`) was created.