Added Kenyan Holidays

[ssiva13]

Added Kenyan Holidays

• New Years Day ............. 1 January.
• Good Friday .................. March or April.
• Easter Monday .............. March or April.
• Labour Day .................... 1st May.
• Madaraka Day ............... 1st June.
• Moi Day ......................... 10th October.
• Kenyatta Day ................. 20th October.
• Jamhuri/Independence Day ........ 12th December.
• Christmas Day ............... 25th December.
• Boxing Day .................... 26th December.

Leaving out the following for the stated reasons

• Idd-ul-Azha .................... Date depending upon the appearance of the moon.
• Idd-ul-Fitr ....................... Date depending upon the appearance of the moon.
• Diwali ............................. Date to be determined in accordance with the Hindu Calendar.

[Nielsvanpach]

I'm closing this one, as I've already seen multiple Kenyan PRs. Could you verify those PRs if the generated dates in the snapshots are fine?

[ssiva13]

Looks like I was late to the party, #110 by @wakaranja looks clean and accurate.