Adjust example for circular component (#1071)

LinusBorg · chrisvfritz · commit 1af0a4e83dee · 2017-08-08T12:18:23.000-04:00
Since vue-loader 13.*, we have to use `require('./component.vue').default` instead of `require('./component.vue')`
diff --git a/src/v2/guide/components.md b/src/v2/guide/components.md
@@ -1288,7 +1288,7 @@ In our case, I'll make that point the `tree-folder` component. We know the child
 
 ``` js
 beforeCreate: function () {
-  this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue')
+  this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue').default
 }
 ```
 

Original file line number	Diff line number	Diff line change
@@ -1288,7 +1288,7 @@ In our case, I'll make that point the `tree-folder` component. We know the child
`1288`	`1288`
`1289`	`1289`	``` js
`1290`	`1290`	`beforeCreate: function () {`
`1291`		`- this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue')`
	`1291`	`+ this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue').default`
`1292`	`1292`	`}`
`1293`	`1293`	```
`1294`	`1294`