Update sln file

StreamJsonRpc.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.28916.44
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31707.426
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "StreamJsonRpc", "src\StreamJsonRpc\StreamJsonRpc.csproj", "{DFBD1BCA-EAE0-4454-9E97-FA9BD9A0F03A}"
 EndProject
@@ -23,6 +23,20 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Benchmarks", "test\Benchmar
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "StreamJsonRpc.Tests.ExternalAssembly", "test\StreamJsonRpc.Tests.ExternalAssembly\StreamJsonRpc.Tests.ExternalAssembly.csproj", "{5936CF62-A59D-4E5C-9EE4-5E8BAFA9F215}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{6FB419A2-3E1C-413A-AEDD-12157AC92395}"
+	ProjectSection(SolutionItems) = preProject
+		src\.editorconfig = src\.editorconfig
+		src\Directory.Build.props = src\Directory.Build.props
+		src\Directory.Build.targets = src\Directory.Build.targets
+	EndProjectSection
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "test", "test", "{F446B894-56AA-4653-ADC0-5FFC911C9C13}"
+	ProjectSection(SolutionItems) = preProject
+		test\.editorconfig = test\.editorconfig
+		test\Directory.Build.props = test\Directory.Build.props
+		test\Directory.Build.targets = test\Directory.Build.targets
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -49,6 +63,12 @@ Global
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{DFBD1BCA-EAE0-4454-9E97-FA9BD9A0F03A} = {6FB419A2-3E1C-413A-AEDD-12157AC92395}
+		{8BF355B2-E3B0-4615-BFC1-7563EADC4F8B} = {F446B894-56AA-4653-ADC0-5FFC911C9C13}
+		{CEF0F77F-19EB-4C76-A050-854984BB0364} = {F446B894-56AA-4653-ADC0-5FFC911C9C13}
+		{5936CF62-A59D-4E5C-9EE4-5E8BAFA9F215} = {F446B894-56AA-4653-ADC0-5FFC911C9C13}
+	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {4946F7E7-0619-414B-BE56-DDF0261CA8A9}
 	EndGlobalSection