Fix alignment of a SHORT variable

typedef struct _COORD {
  SHORT X;
  SHORT Y; // I wanted to take this...
} COORD, *PCOORD;

typedef struct _CONSOLE_SCREEN_BUFFER_INFO {
  COORD      dwSize;
  COORD      dwCursorPosition; // ...of this one
  WORD       wAttributes;      // But it's combined with first 2bytes of this
  SMALL_RECT srWindow;
  COORD      dwMaximumWindowSize;
} CONSOLE_SCREEN_BUFFER_INFO;

If wAttributes has non-zero value, the code breaks.

lib/reline/windows.rb

@@ -131,7 +131,7 @@ class Reline::Windows
     csbi = 0.chr * 22
     @@GetConsoleScreenBufferInfo.call(@@hConsoleHandle, csbi)
     x = csbi[4, 2].unpack('s*').first
-    y = csbi[6, 4].unpack('s*').first
+    y = csbi[6, 2].unpack('s*').first
     Reline::CursorPos.new(x, y)
   end