chore(package): update lerna to version 3.2.1

Closes #69

Author: greenkeeper[bot]

package.json

@@ -22,7 +22,7 @@
     "broccoli-typescript-compiler": "^2.2.0",
     "do-you-even-bench": "^1.0.5",
     "ember-cli": "^3.0.0",
-    "lerna": "^2.5.1",
+    "lerna": "^3.2.1",
     "loader.js": "^4.6.0",
     "nyc": "^11.3.0",
     "qunit": "^2.4.1",