Fix Appveyor builds
Fix Appveyor builds

An extra line from .appveyor.yml needs to be removed
after the switch to python requests (952665a).

Change-Id: I583443f779118683a87b6e3d9216c64da92eab93
Darkdadaah/pywikibot-core,happy5214/pywikibot-core,h4ck3rm1k3/pywikibot-core,smalyshev/pywikibot-core,xZise/pywikibot-core,h4ck3rm1k3/pywikibot-core,PersianWikipedia/pywikibot-core,Darkdadaah/pywikibot-core,hasteur/g13bot_tools_new,hasteur/g13bot_tools_new,wikimedia/pywikibot-core,npdoty/pywikibot,hasteur/g13bot_tools_new,wikimedia/pywikibot-core,npdoty/pywikibot,magul/pywikibot-core,icyflame/batman,VcamX/pywikibot-core,magul/pywikibot-core,valhallasw/pywikibot-core,trishnaguha/pywikibot-core,happy5214/pywikibot-core,jayvdb/pywikibot-core,darthbhyrava/pywikibot-local,jayvdb/pywikibot-core,emijrp/pywikibot-core,TridevGuha/pywikibot-core