Update TA2 bag link

The new name is now consistent with the one in project description

Author: hcostelha

src/TA2/TA2_apps/data/README.txt

@@ -1,7 +1,7 @@
- --> Download the bag file from https://www.dropbox.com/s/r4mlxp6sts84wyp/2016-05-13-03-32-28.bag.tar.gz?dl=0
+ --> Download the bag file from: https://www.dropbox.com/s/u2fxw04qiitv5gv/pick_and_place_box5.tar.bz2?dl=0
 
  --> Use the following command to store usefull data:
   rosbag record -a -O bagname.bag -x "/p3dx/camera_front/image_raw/(.*)"
 
  --> Use the following command to playback data:
- rosbag play bagname.bag
+ rosbag play bagname.bag