Release Google.Cloud.Tools.DocUploader version 0.2.0

Autorelease will fail here, but we can use the tag for a manual
release Kokoro job.

Once this and the release progress reporter have been pushed to
NuGet, we can update the tools config and autorelease should start
working.

tools/Google.Cloud.Tools.DocUploader/Google.Cloud.Tools.DocUploader.csproj

@@ -8,7 +8,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
 
-    <Version>0.1.0</Version>
+    <Version>0.2.0</Version>
     <Description>Tool used by Google .NET release processes for documentation. While there is nothing "secret" in this package, it is unlikely to be useful to other developers. It is only published as a matter of convenience for other Google .NET repositories.</Description>
     <ToolCommandName>docuploader</ToolCommandName>
   </PropertyGroup>