synchronically commits

[pbrzostowski]

I think that we actually want to have sync commits of the messages. In case that there is an error during commitment we want to know that.

[GitCop]

There were the following issues with your Pull Request

• Commit: 6001503
• Commits must be in the following format: %{type}(%{scope}): %{description}

Guidelines are available at https://github.com/microdevs/missy

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[michalkarolik]

Just to clarify why we need that: if reader would commit offset asynchronously its very likely that it will fetch the very same message on next poll.