Changelog for cron-0.3.1

# 0.3.1 * Fix bug that caused some range schedules to not fire at the correct time. See https://github.com/MichaelXavier/cron/issues/18 # 0.3.0 * MTL compatibility updates. # 0.2.6 * Package test files # 0.2.5 * GHC 7.10 support # 0.2.4 * Bugfixes for new task runner feature # 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