oops, don't ignore the builder config

.gitignore

@@ -19,9 +19,6 @@ yarn-error.log
 !/src
 !/tests
 
-# don't lock dependencies for library packages
-!/package-lock.json
-
 # not global build, to be published
 !/global.js
 !/global.js.map
@@ -37,6 +34,7 @@ yarn-error.log
 !/buble.config.js
 !/jest.config.js
 !/webpack.config.js
+!/builder.config.js
 
 # all good projects have a README!
-!/README.md
+!/README.md

builder.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+    nodeModulesToCompile: [
+        'element-behaviors'
+    ],
+}