upgraded project to .net 5.0

Author: niemyjski

build/common.props

@@ -10,7 +10,7 @@
     <MinVerSkip Condition="'$(Configuration)' == 'Debug'">true</MinVerSkip>
     <MinVerTagPrefix>v</MinVerTagPrefix>
 
-    <Copyright>Copyright (c) 2020 Exceptionless.  All rights reserved.</Copyright>
+    <Copyright>Copyright (c) 2021 Exceptionless.  All rights reserved.</Copyright>
     <Authors>Exceptionless</Authors>
     <NoWarn>$(NoWarn);CS1591;NU1701</NoWarn>
     <WarningsAsErrors>true</WarningsAsErrors>

tests/Exceptionless.DateTimeExtensions.Tests/Exceptionless.DateTimeExtensions.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <Import Project="..\..\build\common.props" />
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net5.0</TargetFramework>
     <IsPackable>False</IsPackable>
   </PropertyGroup>
   <ItemGroup>