Fix CHANGELOG.txt

Author: ayjayt

src/py/CHANGELOG.txt

@@ -1,7 +1,7 @@
 v1.3.0
 - Significant refactor, better organization
 - `write_fig` and `_from_object` now take an additional argument:
-  `fail_on_error: bool`. If False, default True, returns a list of errors.
+  `cancel_on_error: bool`. If False, default True, returns a list of errors.
 - Unused `path` argument for `calc_fig` was removed.
 - Fixed race condition where two render tasks would choose the same filename