Fix Gitter link
Fix Gitter link

Orchard2 => OrchardCore
OrchardCMS/Brochard,xkproject/Orchard2,stevetayloruk/Orchard2,xkproject/Orchard2,stevetayloruk/Orchard2,stevetayloruk/Orchard2,petedavis/Orchard2,xkproject/Orchard2,stevetayloruk/Orchard2,xkproject/Orchard2,OrchardCMS/Brochard,petedavis/Orchard2,petedavis/Orchard2,stevetayloruk/Orchard2,xkproject/Orchard2,petedavis/Orchard2,OrchardCMS/Brochard