mangle all the things

package.json

@@ -8,7 +8,7 @@
     "README.md"
   ],
   "scripts": {
-    "shrink": "npx uglify-js -o dist/cal.min.js --compress --mangle -- src/calendar.js",
+    "shrink": "npx uglify-js -o dist/cal.min.js --compress --mangle --mangle-props -- src/calendar.js",
     "build": "mkdir -p dist && cp src/calendar.js dist && npm run shrink && cp build/index.html dist/example.html",
     "serve": "cp src/calendar.js build && npx serve build -p 8000",
     "test": "jest",