Merge pull request #1 from apache/trunk

Updated README.md
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
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+## What changes were proposed in this pull request?
+
+(Please fill in changes proposed in this fix)
+
+## How was this patch tested?
+
+(Please explain how this patch was tested. Ex: unit tests, manual tests)
+(If this patch involves UI changes, please attach a screen-shot; otherwise, remove this)
+
+Please review [Ambari Contributing Guide](https://cwiki.apache.org/confluence/display/AMBARI/How+to+Contribute) before opening a pull request.