feat(test): testing on multiple node versions, closes #5

.travis.yml

@@ -6,7 +6,9 @@ cache:
 notifications:
   email: false
 node_js:
+  - '0.12'
   - '4'
+  - '6'
 before_install:
   - npm i -g npm@^2.0.0
 before_script:

package.json

@@ -9,7 +9,7 @@
     "use-case": "node test/use-case.js & node test/use-case-nested.js",
     "semantic-release": "semantic-release pre && npm publish && semantic-release post",
     "issues": "git-issues",
-    "check": "autochecker 0.12.9 4.0 5.0",
+    "check": "autochecker 0.12.9 4.0 5.0 6",
     "check-0.12": "autochecker 0.12.6",
     "commit": "commit-wizard",
     "size": "t=\"$(npm pack .)\"; wc -c \"${t}\"; tar tvf \"${t}\"; rm \"${t}\";"
@@ -28,6 +28,7 @@
   "author": "Gleb Bahmutov <gleb.bahmutov@gmail.com>",
   "license": "MIT",
   "devDependencies": {
+    "condition-node-version": "1.3.0",
     "git-issues": "1.2.0",
     "gt": "0.10.0",
     "pre-git": "3.8.3",
@@ -44,10 +45,18 @@
         "npm test",
         "npm run use-case"
       ],
-      "pre-push": ["npm run size"],
+      "pre-push": [
+        "npm run size"
+      ],
       "post-commit": [],
       "post-checkout": [],
       "post-merge": []
     }
+  },
+  "release": {
+    "verifyConditions": {
+      "path": "condition-node-version",
+      "node": "4"
+    }
   }
 }