Note updated getFunctionParent behaviour (#1286)

* Note updated getFunctionParent behaviour

* docs: add risk of breakage badge

* Update 2017-03-01-upgrade-to-babel-7-for-tool-authors.md

_posts/2017-03-01-upgrade-to-babel-7-for-tool-authors.md

@@ -128,3 +128,17 @@ babylon.parse(code, {
 See Babylon's [plugin options](https://babeljs.io/docs/core-packages/babylon/#api-plugins).
 
 > Removed `classConstructorCall` plugin [#291](https://github.com/babel/babylon/pull/291) ![low](https://img.shields.io/badge/risk%20of%20breakage%3F-low-yellowgreen.svg)
+
+
+## `babel-traverse`
+
+`getFunctionParent` will no longer return `Program`, please use `getProgramParent` instead [babel/babel#5923](https://github.com/babel/babel/pull/5923). ![low](https://img.shields.io/badge/risk%20of%20breakage%3F-low-yellowgreen.svg)
+
+It doesn't make sense that a function named `getFunctionParent` also returns the Program, so that was removed.
+
+To get the equivalent behavior, you'll need to make a change like 
+
+```diff
+- path.scope.getFunctionParent()
++ path.scope.getFunctionParent() || path.scope.getProgramParent()
+```