Removed net451 from the ef core repository context

Author: jaguzman

src/DotNetToolkit.Repository.EntityFrameworkCore/DotNetToolkit.Repository.EntityFrameworkCore.csproj

@@ -3,13 +3,13 @@
   <Import Project="..\..\build\common.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>net451;netstandard1.3;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>netstandard1.3;netstandard2.0</TargetFrameworks>
     <AssemblyName>DotNetToolkit.Repository.EntityFrameworkCore</AssemblyName>
     <RootNamespace>DotNetToolkit.Repository.EntityFrameworkCore</RootNamespace>
     <Description>A repository context provider for the Entity Framework Core.</Description>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='net451' OR '$(TargetFramework)' == 'netstandard1.3'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.3'">
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="1.1.6" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="1.1.6" />
   </ItemGroup>