add some babel stuff

node_modules/@babel/traverse/README.md

@@ -0,0 +1,33 @@
+# @babel/traverse
+
+> @babel/traverse maintains the overall tree state, and is responsible for replacing, removing, and adding nodes.
+
+## Install
+
+```sh
+$ npm install --save @babel/traverse
+```
+
+## Usage
+
+We can use it alongside Babylon to traverse and update nodes:
+
+```js
+import * as babylon from "babylon";
+import traverse from "@babel/traverse";
+
+const code = `function square(n) {
+  return n * n;
+}`;
+
+const ast = babylon.parse(code);
+
+traverse(ast, {
+  enter(path) {
+    if (path.isIdentifier({ name: "n" })) {
+      path.node.name = "x";
+    }
+  }
+});
+```
+[:book: **Read the full docs here**](https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#babel-traverse)