Dev version bump [skip ci]

Author: nblumhardt

src/Serilog.Settings.Configuration/Serilog.Settings.Configuration.csproj

@@ -1,8 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Description>Microsoft.Extensions.Configuration (appsettings.json) support for Serilog.</Description>
-    <VersionPrefix>3.0.2</VersionPrefix>
+    <VersionPrefix>3.1.0</VersionPrefix>
     <Authors>Serilog Contributors</Authors>
     <TargetFrameworks>netstandard2.0;net451;net461</TargetFrameworks>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>