Update - make the ES5 version as main entry

Author: Lyncee59

Diff for: .gitignore

@@ -31,3 +31,6 @@ node_modules
 
 # Optional REPL history
 .node_repl_history
+
+# Remove dist folder
+dist

Diff for: package.json

@@ -2,7 +2,7 @@
   "name": "immutable-ext",
   "version": "1.1.2",
   "description": "fantasyland compatible extensions",
-  "main": "index.js",
+  "main": "dist/index.js",
   "engines": {
     "node": ">=6.2.0"
   },
@@ -13,13 +13,17 @@
     "immutable": "*"
   },
   "devDependencies": {
-    "immutable": "*",
+    "babel-cli": "^6.24.1",
+    "babel-preset-es2015": "^6.24.1",
     "daggy": "^0.0.1",
     "fantasy-identities": "^0.0.1",
+    "immutable": "*",
     "mocha": "^2.4.5"
   },
   "scripts": {
-    "test": "mocha --watch test/**.js"
+    "test": "mocha --watch test/**.js",
+    "compile": "babel --presets es2015 -d dist/ ./index.js",
+    "prepublish": "npm run compile"
   },
   "keywords": [
     "functional",