Update README to include unsafe actions explanation and recipes

Artur-Sulej / excellent_migrations

An Elixir tool for checking safety of database migrations.

MIT License

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Update README to include unsafe actions explanation and recipes #15

Closed AndriiKlymchuk closed 2 years ago

AndriiKlymchuk commented 2 years ago

When developers get warnings from excellent migrations they should know how to deal with them. First place where they look is lib documentation, therefore It's very important to have explanation of dangerous action and recipes how to implement them in a safe way. I have copied them from https://github.com/fly-apps/safe-ecto-migrations and https://github.com/ankane/strong_migrations adopting examples for Ecto.

AndriiKlymchuk commented 2 years ago

@Artur-Sulej, hi! Could you please take a look at this PR?