README.rst fixes
README.rst fixes

Added link to slideshare presentation
eddelbuettel/annoy,spotify/annoy,spotify/annoy,tjrileywisc/annoy,pombredanne/annoy,eddelbuettel/annoy,eddelbuettel/annoy,subu-cliqz/annoy,spotify/annoy,pombredanne/annoy,subu-cliqz/annoy,eddelbuettel/annoy,subu-cliqz/annoy,pombredanne/annoy,tjrileywisc/annoy,tjrileywisc/annoy,spotify/annoy,tjrileywisc/annoy,subu-cliqz/annoy,pombredanne/annoy