Merge pull request #2823 from gep13/feature/GH-2822

(GH-2822) Add support for .Net Global Tool

src/Cake.Common/Tools/ReportGenerator/ReportGeneratorRunner.cs

@@ -126,7 +126,7 @@ protected override string GetToolName()
         /// <returns>The tool executable name.</returns>
         protected override IEnumerable<string> GetToolExecutableNames()
         {
-            return new[] { "ReportGenerator.exe" };
+            return new[] { "ReportGenerator.exe", "reportgenerator" };
         }
 
         private void AppendQuoted(ProcessArgumentBuilder builder, string key, string value)