hi
soon should be available the latest release of rome
the main change with the 1.x series is a relocation of the classes.
suggestion use:
find ./ -name "*.java" -exec sed -i
"s/com.sun.syndication/com.rometools.rome/g" {} +
for other changes, please, use as reference
https://rometools.github.io/rome/ChangeLog.html
regards
.g