Updated SouthKorea provider to apply the new substitute holidays changed in June 2021.#255

Merged

stelgenhof merged 13 commits intoazuyalabs:developfrom barami:develop

Sep 5, 2021

Commits on Jul 30, 2021

Commits on Aug 10, 2021

SouthKorea Provider: Changes to alternative holiday rules under Presidential Decree, which took effect on August 4.
barami
committed
SouthKorea Provider: Change tests for substitute holidays rules under President Degree.
barami
committed

Commits on Aug 26, 2021

Merge branch 'azuyalabs:develop' into develop
barami
authored

Commits on Sep 1, 2021

Merge branch 'azuyalabs:develop' into develop
barami
authored

Commits on Sep 3, 2021

Commits on Sep 5, 2021

Merge branch 'develop' into develop
stelgenhof
authored