fix tests

package.json

@@ -13,7 +13,7 @@
     "node": ">=0.12.0"
   },
   "scripts": {
-    "test": "xo && ava test.js && echo unicorns | ava test-real.js"
+    "test": "xo && ava test.js && echo unicorns | node test-real.js"
   },
   "files": [
     "index.js"
@@ -29,7 +29,7 @@
     "read"
   ],
   "devDependencies": {
-    "ava": "*",
+    "ava": "^0.2.0",
     "buffer-equals": "^1.0.3",
     "xo": "*"
   },

test-real.js

@@ -1,3 +1,6 @@
-import fn from './';
+'use strict';
+var fn = require('./');
 
-fn().then(data => process.exit(data ? 0 : 1));
+fn().then(function (data) {
+	process.exit(data ? 0 : 1);
+});