Update http abstractions to 1.1.2

Author: xt0rted

src/SendGrid/SendGrid.csproj

@@ -24,7 +24,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
-    <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="1.1.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="1.1.2" />
     <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
   </ItemGroup>