update small changes
merged files
Merge branch 'master' of https://github.com/marcinwal/BattleShips
Merge branch 'master' of https://github.com/marcinwal/BattleShips
shot a cell on the board and sunk a ship
first version
Update README.md
Update README.md
Update README.md
added error module
fixed modules
game engine
adding check_cell for board in case error control switched off