Update to ASP.NET 5

Update to the final release of ASP.NET 5.
Update Shouldly.

Directory.Packages.props

@@ -5,11 +5,11 @@
     <PackageVersion Include="JetBrains.Annotations" Version="2020.1.0" />
     <PackageVersion Include="JustEat.HttpClientInterception" Version="3.0.0" />
     <PackageVersion Include="MartinCostello.Logging.XUnit" Version="0.1.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.0-rc.2.20475.17" />
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="5.0.0-rc.2.20475.17" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="5.0.0" />
     <PackageVersion Include="Microsoft.IdentityModel.Protocols" Version="6.6.0" />
-    <PackageVersion Include="Shouldly" Version="3.0.2" />
-    <PackageVersion Include="System.Text.Json" Version="4.7.2" />
+    <PackageVersion Include="Shouldly" Version="4.0.0" />
+    <PackageVersion Include="System.Text.Json" Version="5.0.0" />
   </ItemGroup>
 
 </Project>

eng/Versions.props

@@ -5,8 +5,8 @@
     <MinorVersion>0</MinorVersion>
     <PatchVersion>0</PatchVersion>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
-    <PreReleaseVersionLabel>rc</PreReleaseVersionLabel>
-    <PreReleaseVersionIteration>2</PreReleaseVersionIteration>
+    <PreReleaseVersionLabel>rtm</PreReleaseVersionLabel>
+    <PreReleaseVersionIteration></PreReleaseVersionIteration>
     <PreReleaseBrandingLabel>RC $(PreReleaseVersionIteration)</PreReleaseBrandingLabel>
     <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>
     <DotNetFinalVersionKind Condition="'$(StabilizePackageVersion)' == 'true'">release</DotNetFinalVersionKind>

global.json

@@ -1,6 +1,6 @@
 {
   "tools": {
-    "dotnet": "5.0.100-rc.2.20479.15"
+    "dotnet": "5.0.100"
   },
 
   "msbuild-sdks": {