Add the 'module' keyword for recognition in Rollup and other ESM bundlers
Add the 'module' keyword for recognition in Rollup and other ESM bundlers

fixes #1805

fatso83/Sinon.JS,fatso83/Sinon.JS,mroderick/Sinon.JS,fatso83/Sinon.JS,mroderick/Sinon.JS,cjohansen/Sinon.JS,mroderick/Sinon.JS,cjohansen/Sinon.JS,cjohansen/Sinon.JS