Added upgrading section.
Added upgrading section.

moritz/otrs,moritz/otrs,MBRG/otrs,muehlbauer/otrs,mburggraf/otrs,s7design/otrs,s7design/otrs,brandonshults01/otrs,MBRG/otrs,thorsteneckel/otrs,crythias/otrs,muehlbauer/otrs,linearregression/otrs,PortgasDAce/otrs,crythias/otrs,eliasp/otrs,StCyr/otrs,muehlbauer/otrs,nilei/otrs,thorsteneckel/otrs,mburggraf/otrs,nilei/otrs,linearregression/otrs,s7design/otrs,thorsteneckel/otrs,crythias/otrs,moritz/otrs,brandonshults01/otrs,noritnk/otrs,PortgasDAce/otrs,oiami/otrs,rudy500/otrs,brandonshults01/otrs,PortgasDAce/otrs,rudy500/otrs,moritz/otrs,linearregression/otrs,brandonshults01/otrs,balazj/otrs,mburggraf/otrs,mburggraf/otrs,MBRG/otrs,vlascoder/otrs,mbeijen/otrs-1,muehlbauer/otrs,brandonshults01/otrs,StCyr/otrs,oiami/otrs,PortgasDAce/otrs,moritz/otrs,mburggraf/otrs,xhoy/otrs,MBRG/otrs,balazj/otrs,linearregression/otrs,vlascoder/otrs,muehlbauer/otrs,eliasp/otrs,mbeijen/otrs-1,balazj/otrs,capeit-tto/otrs,thorsteneckel/otrs,crythias/otrs,MBRG/otrs,s7design/otrs,xhoy/otrs,noritnk/otrs,rudy500/otrs,capeit-tto/otrs,eliasp/otrs,balazj/otrs,oiami/otrs,rudy500/otrs,mbeijen/otrs-1,PortgasDAce/otrs,vlascoder/otrs,xhoy/otrs,xhoy/otrs,oiami/otrs,linearregression/otrs,eliasp/otrs,nilei/otrs,xhoy/otrs,s7design/otrs,eliasp/otrs,nilei/otrs,balazj/otrs,StCyr/otrs,nilei/otrs,StCyr/otrs,noritnk/otrs,crythias/otrs,capeit-tto/otrs,thorsteneckel/otrs,StCyr/otrs,rudy500/otrs,oiami/otrs