Update ISSUE_TEMPLATE.md

Summary:
Thanks for submitting a PR! Please read these instructions carefully:

- [ ] Explain the **motivation** for making this change.
- [ ] Provide a **test plan** demonstrating that the code is solid.
- [ ] Match the **code formatting** of the rest of the codebase.
- [ ] Target the `master` branch, NOT a "stable" branch.

What existing problem does the pull request solve?

A good test plan has the exact commands you ran and their output, provides screenshots or videos if the pull request changes UI or updates the website. See [What is a Test Plan?][1] to learn more.

If you have added code that should be tested, add tests.

Sign the [CLA][2], if you haven't already.

Small pull requests are much easier to review and more likely to get merged. Make sure the PR does only one thing, otherwise please split it.

Make sure all **tests pass** on both [Travis][3] and [Circle CI][4]. PRs that break tests are unlikely to be merged.
Closes https://github.com/facebook/react-native/pull/13385

Differential Revision: D4852068

Pulled By: hramos

fbshipit-source-id: ff193a7c90aa8b00c248575ae647f1fb14eb261f

.github/ISSUE_TEMPLATE.md

@@ -1,11 +1,16 @@
 Please read the following carefully before opening a new issue.
 Your issue may be closed if it does not provide the information required by this template.
 
-We use GitHub Issues for tracking bugs in React Native.
+We use GitHub Issues exclusively for tracking bugs in React Native.
 
 - If you have a question, ask on Stack Overflow: http://stackoverflow.com/questions/tagged/react-native
 - If you have a feature request, post it on Canny: https://react-native.canny.io/feature-requests
 
+Make sure your issue reproduces on master. Your issue may already have been fixed!
+If your issue is present in master and in the stable release, try to reproduce your bug on https://snack.expo.io/
+If you can't reproduce the bug on Snack, provide a sample project. 
+At the very least, provide an example of your code.
+
 --- Delete everything above this line ---
 
 ### Description
@@ -14,8 +19,10 @@ Explain what you did, what you expected to happen, and what actually happens.
 
 ### Reproduction Steps and Sample Code
 
-Try to reproduce your bug on https://snack.expo.io/ and provide a link. 
-If you can't reproduce the bug on Snack, provide a sample project. At the very least, provide an example of your code.
+List all the steps required to reproduce the issue you're reporting. These steps should be clear and concise.
+
+  ***An example of your code is REQUIRED***
+
 
 ### Solution