Update README.md
Rename bitcoin-qt.pro to parabola-qt.pro

I can download this and do a find a replace (bitcoin replaced with parabola)
Merge branch 'patch-2' of https://github.com/Smeagol-Gollum/parabola
Merge branch 'patch-3' of https://github.com/Smeagol-Gollum/parabola