fix: update default exports

Author: mrholek

js/index.esm.js

@@ -5,8 +5,4 @@
  * --------------------------------------------------------------------------
  */
 
-import customTooltips from './src/custom-tooltips'
-
-export {
-  customTooltips
-}
+export { default as customTooltips } from './src/custom-tooltips.js'

js/index.umd.js

@@ -6,7 +6,7 @@
  */
 
 // eslint-disable-next-line no-unused-vars
-import customTooltips from './src/custom-tooltips'
+import customTooltips from './src/custom-tooltips.js'
 
 export default {
   customTooltips