fix(system.js): use date-fns index imports for system.js users

Author: Matt Lewis

package.json

@@ -125,7 +125,7 @@
   "dependencies": {
     "@ng-bootstrap/ng-bootstrap": "^1.0.0-alpha.0",
     "@types/date-fns": "0.0.2",
-    "calendar-utils": "0.0.32",
+    "calendar-utils": "0.0.33",
     "date-fns": "^1.3.0"
   }
 }

webpack.config.umd.ts

@@ -51,13 +51,13 @@ module.exports = {
     },
     'date-fns/is_same_day': {
       root: ['dateFns', 'isSameDay'],
-      commonjs: 'date-fns/is_same_day',
-      commonjs2: 'date-fns/is_same_day'
+      commonjs: 'date-fns/is_same_day/index',
+      commonjs2: 'date-fns/is_same_day/index'
     },
     'date-fns/get_iso_week': {
       root: ['dateFns', 'getISOWeek'],
-      commonjs: 'date-fns/get_iso_week',
-      commonjs2: 'date-fns/get_iso_week'
+      commonjs: 'date-fns/get_iso_week/index',
+      commonjs2: 'date-fns/get_iso_week/index'
     },
   },
   module: {