updated README with docs for diffy tool
updated README with docs for diffy tool

Gamoshi/jolt,MichaelTimper/jolt,bazaarvoice/jolt,milosimpson/jolt,Gamoshi/jolt,bivasdas/jolt,tpanagos/jolt,MichaelTimper/jolt,bivasdas/jolt,milosimpson/jolt,bazaarvoice/jolt,tpanagos/jolt