Remove unnecessary log

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Change launchMode of main activity to singleTask

When user return to main activity using notification, it create one more
instance of main activity on main activity.
Solve this problem using singleTask launchMode.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Update version for publishing

Signed-off-by: SeongJae Park <sj38.park@gmail.com>