chore(package): update lerna to version 3.8.0

Closes #29

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
     "ava": "0.25.0",
     "awoo": "4.1.0",
     "codecov": "3.1.0",
-    "lerna": "3.3.2",
+    "lerna": "3.8.0",
     "lerna-changelog": "0.8.0",
     "nyc": "12.0.2",
     "snazzy": "7.1.1",