use modules: false option for babel

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mightyplow/jslib",
-  "version": "0.9.0",
+  "version": "0.9.1",
   "description": "js, helpers library",
   "main": "dist/index.js",
   "devDependencies": {
@@ -32,7 +32,9 @@
   "license": "ISC",
   "babel": {
     "presets": [
-      "es2015"
+      ["es2015", {
+        "modules": false
+      }]
     ]
   }
 }