Add Cake NuGet client user agent (#297)

*fixes NuGet/NuGetGallery#5238

Author: devlead

src/Stats.ImportAzureCdnStatistics/knownclients.yaml

@@ -157,6 +157,10 @@
   - regex: '(NuGet Test Client)/?(\d+)?\.?(\d+)?\.?(\d+)?'
     family_replacement: 'NuGet Test Client'
 
+  # Cake NuGet Client
+  - regex: '(Cake NuGet Client)/(\d+)\.(\d+)\.?(\d+)?'
+    family_replacement: 'Cake NuGet Client'
+
   # NuGet - Keep this one at the bottom of this file as a catch-all resolver
   - regex: '(NuGet)/?(\d+)\.(\d+)\.?(\d+)?'
     family_replacement: 'NuGet'

tests/Tests.Stats.ImportAzureCdnStatistics/UserAgentParserFacts.cs

@@ -65,6 +65,7 @@ public TheFromPackageStatisticMethod(ITestOutputHelper testOutputHelper)
             [InlineData("NuGet MSBuild Task/4.0.0 (Microsoft Windows 10.0.15063)", "NuGet MSBuild Task", "4", "0", "0")]
             [InlineData("NuGet .NET Core MSBuild Task/4.4.0 (Microsoft Windows 10.0.15063)", "NuGet .NET Core MSBuild Task", "4", "4", "0")]
             [InlineData("NuGet Desktop MSBuild Task/4.4.0 (Microsoft Windows 10.0.15063)", "NuGet Desktop MSBuild Task", "4", "4", "0")]
+            [InlineData("Cake NuGet Client/4.3.0 (Microsoft Windows 10.0.15063)", "Cake NuGet Client", "4", "3", "0")]
             public void RecognizesCustomClients(string userAgent, string expectedClient, string expectedMajor, string expectedMinor, string expectedPatch)
             {
                 var parsed = _parser.ParseUserAgent(userAgent);