fix: make default export work with CommonJS

Author: gajus

.babelrc

@@ -5,6 +5,7 @@
     "env": {
         "development": {
             "plugins": [
+                "add-module-exports",
                 "ramda",
                 "transform-object-rest-spread",
                 "syntax-flow",
@@ -15,6 +16,7 @@
         },
         "production": {
             "plugins": [
+                "add-module-exports",
                 "ramda",
                 "transform-object-rest-spread",
                 "syntax-flow",

package.json

@@ -25,6 +25,7 @@
   },
   "devDependencies": {
     "babel-cli": "^6.11.4",
+    "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-istanbul": "^1.0.3",
     "babel-plugin-ramda": "^1.1.5",
     "babel-plugin-syntax-flow": "^6.13.0",