Release 1.2.0

• changelog. (a84cb6b)
• add close button for DateTimePicker (bb92361)
• update README.md (e24781d)
• Merge pull request #1 from hamworks/add/phpunit (a400554)
• add update schedules test (7d5b08c)
• test for update_post_term_relations (88b5cc1)
• add test stub (5059bdb)
• fix plugin comments (721cdf2)
• fix plugin comments (33dda2e)