Updated README for libxml2/libxslt dependencies
Updated README for libxml2/libxslt dependencies

katharh/ncclient,kroustou/ncclient,ncclient/ncclient,joysboy/ncclient,nnakamot/ncclient,vnitinv/ncclient,earies/ncclient,sebastianw/ncclient,OpenClovis/ncclient,lightlu/ncclient,leopoul/ncclient,aitorhh/ncclient,nwautomator/ncclient,einarnn/ncclient,cmoberg/ncclient,GIC-de/ncclient