Readme does not describe improvements in ESWA paper

[peschue]

some issues are still TODOs there

Mishal Kazmi, Peter Schüller, and Yücel Saygın. Improving Scalability of Inductive Logic Programming via Pruning and Best-Effort Optimisation. Expert Systems With Applications 87, pages 291-303, 2017, DOI: 10.1016/j.eswa.2017.06.013.