Update mainwindow.cpp
Update mainwindow.cpp

Update version # in "About" box.
amit133/KTAB,amit133/KTAB,KAPSARC/KTAB,lsyaseen/KTAB,lsyaseen/KTAB,amit133/KTAB,KAPSARC/KTAB,lsyaseen/KTAB,amit133/KTAB,KAPSARC/KTAB