Deprecated fetch_many method since it was deprecated in sqlx 0.7.4.

[m-nawa]

Hello.

I use this crate because it is very useful for using sqlx. Now that I have updated sqlx to 0.7.4, I get a warning on conditional_query_as!().

warning: use of deprecated method `sqlx::query::Map::<'q, DB, F, A>::fetch_many`: Only the SQLite driver supports multiple statements in one prepared statement and that behavior is deprecated. Use `sqlx::raw_sql()` instead.

It seems that Map::fetch_many() was deprecated in sqlx 0.7.4.

I am not using this method but I get a warning. Therefore, I would like to modify it so that the warning is only issued when the method is used.

Please let me know if there is something I should do.

Thanks.

[kyrias]

Hmm, we could do this and cut a release, though I think that we should probably just do a major bump and drop support for it entirely.

If you feel like it you could add something like the following to the Unreleased section of CHANGELOG.md. Otherwise I'll do it myself right before cutting the release.

### Deprecated

- Deprecated `fetch_many` method since it was deprecated in `sqlx` 0.7.4. ([#17](https://github.com/kyrias/sqlx-conditional-queries/pull/17))

[m-nawa]

Thank you for your reply!

I have added about this PR in the Unreleased section of CHANGELOG.md.

I don't use fetch_many() in my product, so I'm not too sure if it should be removed or kept.
However, I think the users will be happy with the current form where they can be told what to do by deprecated warnings.

How about doing this fix in patch bump and removing fetch_many in major bump?

[kyrias]

Thank you!