Update for the September 2019 patch.
-- Updated Shipyard production bonus. Now gives +1 Production to all Coasttiles. Previously it gave +1 Production to Fishing Boats and with the patch it gives +1 Production to unimproved Coast tiles, so I've just rolled it all together.
-- Updated text.
-- Optimized SQL.

Updated for June 2019 patch.
- Changed Harbor citizen specialist yield from +2 Production to +1.
- The Seaport will now increase the yield of Harbor specialists by +1 Production.

Updated for Gathering Storm.
Optimized SQL.

Rebalance of specialist yield changes.

City Center gold from adjacent water tiles moved from Cartography to Celestial Navigation.

Fixed code; City Center adjacency now working properly.

Disregard previous changelog. Modded in adjacency bonuses for City Center district: +1 food for each adj. coastal tile, +1 gold for each adj. coastal tile, and +1 production for each adjacent coastal time at certain technologies.

City Center now receives +1 gold for each adjacent coastal tile at Sailing and Cartography, and +1 production for each adjacent coastal tile at Shipbuilding.

Version 1.2: Compatibility update for Spring 2017 update.
- Removed lighthouse change since Firaxis added +1 food to all coastal tiles.
- Restored shipyard bonus equivalent to Harbor adjacency bonus.
- Removed +1 production from shipyard.
- Removed Seaport bonus gold to coastal tiles since Firaxis added +2 themselves.
- Changed Seaport bonus +1 gold to ocean tiles to +2 gold.