Corrected changelog for 3.1.1 release
Corrected changelog for 3.1.1 release

fruux/sabre-dav,PVince81/sabre-dav,kriswebdev/sabre-dav,fruux/sabre-dav,c0d3z3r0/sabre-dav,staabm/sabre-dav,staabm/sabre-dav,PVince81/sabre-dav,staabm/sabre-dav,kriswebdev/sabre-dav,c0d3z3r0/sabre-dav,PVince81/sabre-dav,kriswebdev/sabre-dav,fruux/sabre-dav,c0d3z3r0/sabre-dav