fix: import for GroupByNodule

package.json

@@ -1,6 +1,6 @@
 {
   "name": "lovelacejs",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Lovelace.js is a modern JavaScript Library to create objects that easily mutate data through relationships, filtering, and tranforming the shape of data.",
   "main": "index.js",
   "directories": {

src/index.js

@@ -3,13 +3,15 @@ import Nodule from './entities/Nodule.js'
 import FilterNodule from './entities/nodules/FilterNodule.js'
 import JoinNodule from './entities/nodules/JoinNodule.js'
 import TransformNodule from './entities/nodules/TransformNodule.js'
+import GroupByNodule from './entities/nodules/GroupByNodule.js'
 
 export {
   Table,
   Nodule,
   FilterNodule,
   JoinNodule,
-  TransformNodule
+  TransformNodule,
+  GroupByNodule
 }
 
 export default {
@@ -17,5 +19,6 @@ export default {
   Nodule,
   FilterNodule,
   JoinNodule,
-  TransformNodule
+  TransformNodule,
+  GroupByNodule
 }