fix some file extensions

Task/Sierpinski-triangle/DWScript/sierpinski-triangle.dw

@@ -0,0 +1,17 @@
+procedure PrintSierpinski(order : Integer);
+var
+   x, y, size : Integer;
+begin
+   size := (1 shl order)-1;
+   for y:=size downto 0 do begin
+      Print(StringOfChar(' ', y));
+      for x:=0 to size-y do begin
+         if (x and y)=0 then
+            Print('* ')
+         else Print('  ');
+      end;
+      PrintLn('');
+   end;
+end;
+
+PrintSierpinski(4);