Remove columbus day in US

Removed Columbus Day from US class as it is no public holiday

Fix errors in US classes

Merge pull request #19 from kruu-com/bug/ff/memory-exhausted

Fix Us states classes

Fix file and class name for US MI

Merge pull request #18 from kruu-com/bug/ps/fix-wrong-classname

Fix: Rename class from UsMI to UsMi

Add state holidays for the US

Merge pull request #17 from kruu-com/feature/ff/extend-us-by-states

Feature/ff/extend us by states

Change handling for missing state class, fix US and SE, change PL states

1.6.0

Merge pull request #14 from kruu-com/feature/docker-for-unit-tests-pu…

Add Weltfrauentag to DeMv

Merge pull request #13 from kruu-com/feture/add-frauentag-to-de-mv

Add "Internationaler Frauentag" to DeMv

New ISO code of corse

France changed the ISO code of corse from COR to 20R

Add Weltkindertag to Germany Thuringia (DeTh)

Merge pull request #11 from kruu-com/feature/add-weltkindertag-for-de-th

add weltkindertag to DeTh

Add missing Reformationstag for Germany Bremen

Merge pull request #10 from msvujnovic-becklyn/master

Added missing holiday Reformationstag to Germany-Bremen

Add state DK-85 (Sjaelland)

Merge pull request #9 from kruu-com/dev

Add state DK-85 (Sjaelland)