feat(package): Add support for older NodeJS versions

Author: ghaiklor

.babelrc

@@ -1,3 +1,4 @@
 {
-  "presets": ["es2015-node4"]
+  "presets": ["es2015"],
+  "plugins": ["add-module-exports"]
 }

.travis.yml

@@ -7,7 +7,12 @@ notifications:
   email: true
 node_js:
   - stable
+  - 5
   - 4
+  - 0.12
+  - 0.10
+before_install:
+  - npm install -g npm@latest
 before_script:
   - npm prune
 after_success:

package.json

@@ -1,5 +1,6 @@
 {
   "name": "passport-github-token",
+  "version": "0.0.0-semantic-release",
   "description": "Passport strategy for authenticating with GitHub via OAuth2 access tokens",
   "main": "lib/index.js",
   "scripts": {
@@ -31,7 +32,8 @@
   },
   "devDependencies": {
     "babel-cli": "6.4.5",
-    "babel-preset-es2015-node4": "2.0.3",
+    "babel-plugin-add-module-exports": "0.1.2",
+    "babel-preset-es2015": "6.3.13",
     "chai": "3.4.1",
     "chai-passport-strategy": "0.2.0",
     "coveralls": "2.11.6",