Target netstandard2.0 fix for #1 (#2)

* Target netstandard2.0 fix for #1
* Remove GitVersion from all targets

Author: holytshirt

NHibernate.Logging.Serilog/NHibernate.Logging.Serilog.csproj

@@ -1,20 +1,23 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net461</TargetFramework>
+    <TargetFrameworks>net461;netstandard2.0</TargetFrameworks>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Description>Serilog logging provider for NHibernate</Description>
     <Authors>lnu</Authors>
     <PackageReleaseNotes></PackageReleaseNotes>
     <PackageTags>NHibernate Serilog Logging</PackageTags>
     <PackageProjectUrl>https://github.com/lnu/NHibernate.Logging.Serilog</PackageProjectUrl>
+    <PackageTags>NHibernate Serilog</PackageTags>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GitVersion" Version="3.6.5" PrivateAssets="All" />
     <PackageReference Include="NHibernate" Version="5.1.0" />
     <PackageReference Include="Serilog" Version="2.6.0" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == 'net461'">
+    <PackageReference Include="GitVersion" Version="3.6.5" PrivateAssets="All" />
+  </ItemGroup>
 
   <ItemGroup>
     <Folder Include="Properties\" />