Merge branch '29-remove-border-on-same-colored-adjacent-cells' into 'master'

Resolve "Remove border on same colored adjacent cells"

Closes #29

See merge request !26

lib/provider/data.dart

@@ -240,6 +240,10 @@ class Data extends ChangeNotifier {
     return _cells[0][0].value;
   }
 
+  int getCellValue(int col, int row) {
+    return _cells[row][col].value;
+  }
+
   int get movesCount => _movesCount;
   void updateMovesCount(int movesCount) {
     _movesCount = movesCount;