How-to-Contribute.md

@@ -47,3 +47,4 @@ A [pull request](https://github.com/FAForever/db/issues?q=is%3Apr+is%3Aclosed) t
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 * Consider adding data for development to the [test-data.sql](https://github.com/FAForever/db/blob/develop/test-data.sql)
 * Be familiar with [Database normalization](https://www.wikiwand.com/en/Database_normalization)
+* Test your migration on the test server
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