fix: creating promise for every delayed saving to await #30
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In the first algorithm, there could be calls to be accumulated in the same saving moment, bug with no savingPromise defined yet to await, making them susceptible to be ended after the semaphore release. With this change. the awaitPromise is generated synchronously just after the first request to be accumulated is received, so, every accumulating promise will start to await for it too to complete.
I'll figure out later how to write a test that checks this specific error case