FIX: document error on master branch according to #839
FIX: document error on master branch according to #839

MithrilJS/mithril.js,tivac/mithril.js,lhorie/mithril.js,mrvicadai/mithril.js,pygy/mithril.js,tivac/mithril.js,MithrilJS/mithril.js,impinball/mithril.js,mrvicadai/mithril.js,lhorie/mithril.js,barneycarroll/mithril.js,pygy/mithril.js,impinball/mithril.js,barneycarroll/mithril.js