adjust assignment 7

[artnie]

it says

In the file "turtlesim-tf.lisp" write a function FOLLOW-TURTLE-IN-A-LOOP
which accepts 2 arguments: FOLLOWER-NAME and FOLLOWEE-NAME, which are turtle names,
e.g. the strings "turtle1" and "turtle2".
This function

initializes a new CL-TF:TRANSFORM-LISTENER and a new publisher
for turtle command velocities (see the SET-TURTLE-VELOCITY function from
assignment_6) that will send commands to the turtle called FOLLOWER-NAME.

but the function shouldn't init a new publisher, not a new transform listener

[artnie]

c2b4119