+ * added --version and --help options.
+ * added manpage.
+ * popup error dialog when .taskrc does not exist.
+ * added --debug.
+ * supported versions of taskwarrior are 2.2.0 and 2.0.0.
+ * added taskwarrior version checking.
+ * added support for taskwarrior 2.2.0 (avoid confirmation query).
+ * added window position and size restore.