Incorrect repo in readme

[erik-farmer]

The existing clone and cd are invalid for the examples/flask_sqlalchemy/README.md file. The README should read:

# Get the example project code
git clone https://github.com/graphql-python/graphene-sqlalchemy.git
cd graphene-sqlalchemy/examples/flask_sqlalchemy

[syrusakbary]

This issue is fixed by #14. Closing :)

[github-actions]

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