chore: update libundler

package.json

@@ -2,12 +2,13 @@
   "private": true,
   "license": "MIT",
   "scripts": {
-    "bs": "lerna bootstrap"
+    "bs": "lerna bootstrap",
+    "build": "lerna run build"
   },
   "devDependencies": {
     "del": "^3.0.0",
     "lerna": "^2.10.1",
-    "libundler": "^1.5.1",
+    "libundler": "^1.6.0",
     "npm-run-all": "^4.1.2",
     "prettier": "^1.11.1",
     "trash-cli": "^1.4.0",

yarn.lock

@@ -4888,9 +4888,9 @@ levn@^0.3.0, levn@~0.3.0:
     prelude-ls "~1.1.2"
     type-check "~0.3.2"
 
-libundler@^1.5.1:
-  version "1.5.1"
-  resolved "https://registry.npmjs.org/libundler/-/libundler-1.5.1.tgz#d3434301df9e5c300dfcd488e3a06109c96f0118"
+libundler@^1.6.0:
+  version "1.6.0"
+  resolved "https://registry.npmjs.org/libundler/-/libundler-1.6.0.tgz#6b947256d651adf8ba22c8165daeea9fade12d6e"
   dependencies:
     "@babel/core" "^7.0.0-beta.42"
     "@babel/plugin-external-helpers" "^7.0.0-beta.42"