remove unnecessary TODO
remove unnecessary TODO

Turns out it does actually work on logarithmic plots

tommy-u/chaco,tommy-u/chaco,burnpanck/chaco,tommy-u/chaco,burnpanck/chaco,burnpanck/chaco,ContinuumIO/chaco,ContinuumIO/chaco,ContinuumIO/chaco,ContinuumIO/chaco