Bump version to v1.2.1: Improve documentation and update dev dependency

Bump version to v1.2.0: Enable smart reuse via currentExecution gette…

…r to expose the active task's promise

Bump version v1.1.4: README improvements

Bump version to v1.1.3: Add resilience test, improve README, implemen…

…tation refinement

Bump version to v1.1.2: Fix bug where a rejecting task caused all oth…

…er pending tasks to reject without execution

Bump version to v1.1.1: README and Documentation enhancements

Bump version to v1.1.0: Add backpressure metric for resource manageme…

…nt decisions

First Release: v1.0.0