feat(effects): remove one overload from create-effect function

[EricPoul]

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• [x] The commit message follows our guidelines: https://github.com/ngneat/effects/blob/master/CONTRIBUTING.md#commit
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What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
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What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

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[EricPoul]

I removed one overload from createEffect to allow to return of both Action and an array of Action in one effect to dispatch them.

[EricPoul]

Could you bump this release? @NetanelBasal

[NetanelBasal]

done