(maint) Make GitReleaseManager.Cli default project

As answered here:

https://stackoverflow.com/a/6792308/671491

The first project in the sln file is the one that is set as the default
startup project when opened in Visual Studio. This prevents the need to
manually set this once the solution is opened.

Author: gep13

src/GitReleaseManager.sln

@@ -2,10 +2,10 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.6.33801.468
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GitReleaseManager.Tests", "GitReleaseManager.Tests\GitReleaseManager.Tests.csproj", "{FAD045A3-CF63-48CA-BA49-8F4D79E3EF4F}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GitReleaseManager.Cli", "GitReleaseManager.Cli\GitReleaseManager.Cli.csproj", "{F1163F09-3D4E-4F95-AF46-24C15AB297FB}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GitReleaseManager.Tests", "GitReleaseManager.Tests\GitReleaseManager.Tests.csproj", "{FAD045A3-CF63-48CA-BA49-8F4D79E3EF4F}"
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GitReleaseManager.Core", "GitReleaseManager.Core\GitReleaseManager.Core.csproj", "{B02A026E-CA3A-48F4-BBA9-EB337B0A2035}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{C87778A7-B100-4D05-A050-BA37BD59058C}"