update export of package version (#187)

* update export of package version

---------

Co-authored-by: Gavin Rehkemper <grehkemper@esri.com>

src/EsriLeafletVector.js

@@ -1,3 +1,7 @@
-export { version as VERSION } from '../package.json';
+// export version
+import packageInfo from '../package.json';
+const version = packageInfo.version;
+export { version as VERSION };
+
 export { VectorBasemapLayer, vectorBasemapLayer } from './VectorBasemapLayer';
 export { VectorTileLayer, vectorTileLayer } from './VectorTileLayer';