Adapt for Rollup 0.56 and switch to uglifyjs.terser
rollup 0.56 in experimental requires some changes to rollup.config.js and the output is no longer supported by uglifyjs so switched to uglifyjs.terser
rollup 0.56 in experimental requires some changes to rollup.config.js and the output is no longer supported by uglifyjs so switched to uglifyjs.terser