chore: Bump lerna to 3.1.1.

Author: amiller-gh

package.json

@@ -27,7 +27,7 @@
     "chai": "^3.5.0",
     "husky": "^0.14.3",
     "istanbul": "^0.4.5",
-    "lerna": "^2.11.0",
+    "lerna": "^3.1.1",
     "loader-utils": "^1.1.0",
     "markdown-toc": "^1.2.0",
     "mocha": "^3.4.2",