Replace deprecated uglify options compress.warnings with warnings (#510)

* Replace deprecated uglify options compress.warnings with warnings

* Last commit accidentally flipped the value of warnings

Author: davnicwil

rollup.config.js

@@ -34,8 +34,8 @@ if (env === 'production') {
         pure_getters: true,
         unsafe: true,
         unsafe_comps: true,
-        warnings: false
       },
+      warnings: false
     })
   );