Fixes 100% CPU Python process [may require manual update]

This release includes a fix for #147 where the background update check would often hang at 100% CPU. The workflow continues to function but the problem could severely impact battery life and performance of other processes.

This problem started or at least became more common with macOS 10.12.4. Unfortunately since the update check is hanging most people will not automatically see the update prompt. The workaround was within the Alfred-Workflow library that many workflows use... so be sure to check your other workflows for manual updates!