Adding some is_* methods

Adding some is_* methods.

is_after
is_before
is_date
is_equal
is_exists
is_first_day_of_month
is_friday
is_last_day_of_month
is_leap_year
is_monday
is_same_day
is_same_hour
is_same_minute
is_same_month
is_same_second
is_same_year
is_saturday
is_sunday
is_thursday
is_tuesday
is_wednesday

What's Changed

• [feat]: implement is_* methods by @yashvesikar in #5

New Contributors

• @yashvesikar made their first contribution in #5

Full Changelog: v0.1.0...v0.1.1