Fix missing ts def (#5689)

* fix: missing typescript definition file

* chore: update changelog for missing ts file

packages/react-navigation/CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## Changed
 
 - Updated react-native-gesture-handler to ~3.1.0
+- Fix missing TypeScript definitions file in release package
 
 ## [3.4.0] - [2019-03-15](https://github.com/react-navigation/react-navigation/releases/tag/3.4.0)
 

packages/react-navigation/package.json

@@ -28,7 +28,8 @@
   },
   "files": [
     "src",
-    "NavigationTestUtils.js"
+    "NavigationTestUtils.js",
+    "typescript"
   ],
   "peerDependencies": {
     "react": "*",