add missing API_KEY export in run test

jvmvik · web-flow · commit 22d94fa89b96 · 2019-04-02T09:13:00.000-05:00
diff --git a/README.md b/README.md
@@ -324,5 +324,6 @@ Contributions are welcome, feel to submit a pull request!
 To run the tests:
 
 ```bash
+export API_KEY="your api key"
 rake test
 ```
