build mjs files & make stable release

.gitignore

@@ -1,3 +1,4 @@
 /node_modules/
 /package-lock.json
-/main.es5.js*
+/main.cjs.js*
+/main.mjs.js*

.npmignore

@@ -1,2 +1,3 @@
 *
-!/main.es5.js*
+!/main.cjs.js*
+!/main.mjs.js*

build.js

@@ -0,0 +1,34 @@
+const babel = require('@babel/core');
+const fs = require('fs');
+
+{
+	const {code, map} = babel.transformFileSync('./main.js', {
+		presets: [
+			['@babel/preset-env', {
+				targets: {
+					node: '4.0',
+				},
+				modules: 'cjs',
+			}],
+		],
+		sourceMaps: true,
+	});
+	fs.writeFileSync('./main.cjs.js', `${code}\n//# sourceMappingURL=main.cjs.js.map`);
+	fs.writeFileSync('./main.cjs.js.map', JSON.stringify(map));
+}
+
+{
+	const {code, map} = babel.transformFileSync('./main.js', {
+		presets: [
+			['@babel/preset-env', {
+				targets: {
+					node: '4.0',
+				},
+				modules: false,
+			}],
+		],
+		sourceMaps: true,
+	});
+	fs.writeFileSync('./main.mjs.js', `${code}\n//# sourceMappingURL=main.mjs.js.map`);
+	fs.writeFileSync('./main.mjs.js.map', JSON.stringify(map));
+}

package.json

@@ -1,18 +1,18 @@
 {
   "name": "babel-plugin-transform-promise-to-bluebird",
-  "version": "2.0.0-beta.1",
+  "version": "2.0.0",
   "description": "Transforms *Promise* to *bluebird*",
-  "main": "main.es5.js",
+  "main": "main.cjs.js",
+  "module": "main.mjs.js",
   "devDependencies": {
-    "@babel/cli": "^7.0.0-beta",
-    "@babel/core": "^7.0.0-beta",
-    "@babel/preset-env": "^7.0.0-beta"
+    "@babel/core": "^7.0.0",
+    "@babel/preset-env": "^7.0.0"
   },
   "dependencies": {
-    "@babel/helper-module-imports": "^7.0.0-beta"
+    "@babel/helper-module-imports": "^7.0.0"
   },
   "scripts": {
-    "prepublish": "babel main.es2015.js --out-file main.es5.js --source-maps"
+    "prepublish": "node ./build.js"
   },
   "repository": {
     "type": "git",