Update Koszalin Zegrze Airport (OSZ) and Franklin Municipal John Beverly Rose Airport (FKN)

[bc291]

1. Add EPKZ icao for OSZ iata Koszalin Zegrze Airport, formerly EPKO,
2. Add FKN iata for KFKN icao Franklin Municipal John Beverly Rose Airport

[bc291]

Also, should we keep both EPKZ and EPKO for Koszalin? In that case tests fail.

[coveralls]

Pull Request Test Coverage Report for Build 2781327206

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 88.889%

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Totals
Change from base Build 2771437827:	0.0%
Covered Lines:	31
Relevant Lines:	34

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💛 - Coveralls

[mborsetti]

Thanks for the contribution!

It appears that the correct ICAO Location Indicator for Koszalin is EPKZ even though it does not appear in SkyVector, which gets its data from ARINC. Unfortunately we do not support historical codes so an aerodrome can only have one indicator.