Reverse order of length and array fields

I reckon it makes a bit more sense to have the length first and then the
pointer to the very first element of the array than the other way
around.

libgotwtxt.py

@@ -273,8 +273,8 @@ class TwtFile:
 
 class _TwtFile(ctypes.Structure):
     _fields_ = [("twter", ctypes.POINTER(_Twter)),
-                ("twts", ctypes.POINTER(ctypes.POINTER(_Twt))),
-                ("twts_len", ctypes.c_int)]
+                ("twts_len", ctypes.c_int),
+                ("twts", ctypes.POINTER(ctypes.POINTER(_Twt)))]
 
     def to_python(self):
         twtfile = TwtFile()

libtwtxt.go

@@ -49,8 +49,8 @@ struct twt {
 struct twt_file {
 	struct twter *twter;
 	//*info *info;
-	struct twt *twts;
 	int twts_len;
+	struct twt *twts;
 };
 */
 import "C"