upgrade protobuf-net version to 2.3.13

Author: vla

src/Es.Serializer.Jil/Es.Serializer.Jil.csproj

@@ -25,7 +25,7 @@
 
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
-    <PackageReference Include="Microsoft.CSharp" Version="4.4.1" />
+    <PackageReference Include="Microsoft.CSharp" Version="4.5.0" />
   </ItemGroup>
 
 </Project>

src/Es.Serializer.ProtoBuf/Es.Serializer.ProtoBuf.csproj

@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="protobuf-net" Version="2.3.7" />
+    <PackageReference Include="protobuf-net" Version="2.3.13" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net40' OR '$(TargetFramework)' == 'net45' ">

src/PerformanceTest/PerformanceTest.csproj

@@ -29,7 +29,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="protobuf-net" Version="2.3.7" />
+    <PackageReference Include="protobuf-net" Version="2.3.13" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(TargetFramework)' == 'netcoreapp1.1' OR '$(TargetFramework)' == 'netcoreapp2.0' ">