Added midsummer eve to holidays
Added midsummer eve to holidays

thomasguillory/holidays,alexdunae/holidays,okdas/holidays,causztic/holidays,seanhandley/holidays,ghiculescu/holidays,jak78/holidays,harvesthq/holidays,kreintjes/holidays,ptrimble/holidays,johankok/holidays,alexdunae/holidays,HealthWave/holidays,ghiculescu/holidays,mirelon/holidays,ptrimble/holidays,hubbiz/holidays,george-semenov/holidays,rtcreativegroup/holidays