Changelog for cron-0.2.4

# 0.2.3 * Add new in-process task runner feature. Credit to @AndrewRademacher # 0.2.2 * Fix edge case when day of month and day of week are both specified. Credit to @joelwilliamson # 0.2.1 * Fix day of week bug. Credit to @meteogrid # 0.1.2 * Relax dependency on text to allow 1.0