v3.1.0

• #189 - pass original EventId through to logger providers (@david-driscoll)
• #188 - bump Serilog dependency version (@bdovaz)
• #182 - README updates (@Rabadash8820)
• #166 - cache parsed message templates (@nblumhardt)
• #173 - use latestFeature in global.json (@skomis-mm)
• #164 - suppress exceptions from FormattedLogValues (@nblumhardt)
• #165 - pin .NET Core SDK version (@ralphhendriks)
• #160 - add stringification support (@jonnybi)
• #156 - avoid deprecated NuGet package properties (@andrewlock)
• #152 - tidy up and documentation updates (@sungam3r)