Run .NET Core 2.0 as test target on Travis, since that's the tooling version required to build

Author: nblumhardt

build.sh

@@ -7,5 +7,5 @@ for path in src/**/*.csproj; do
 done
 
 for path in test/*.Tests/*.csproj; do
-    dotnet test -f netcoreapp1.0  -c Release ${path}
+    dotnet test -f netcoreapp2.0  -c Release ${path}
 done

test/Serilog.Sinks.File.Tests/Serilog.Sinks.File.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net452;netcoreapp1.0</TargetFrameworks>
+    <TargetFrameworks>net452;netcoreapp2.0</TargetFrameworks>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <AssemblyName>Serilog.Sinks.File.Tests</AssemblyName>
     <AssemblyOriginatorKeyFile>../../assets/Serilog.snk</AssemblyOriginatorKeyFile>