with unity 2018, last modified date is empty

[unitycoder]

probably filename have changed etc.

*actually just need to add projectname.sln check, adding for next build..

UnityLauncher/UnityLauncher/Form1.cs

Lines 1185 to 1200 in f8c7063

	string csprojFile = Path.Combine(projectPath, projectName + ".csproj");
	// editor only project
	if (File.Exists(csprojFile) == false)
	{
	csprojFile = Path.Combine(projectPath, projectName + ".Editor.csproj");
	}
	// maybe 4.x project
	if (File.Exists(csprojFile) == false)
	{
	csprojFile = Path.Combine(projectPath, "Assembly-CSharp.csproj");
	}
	// get last modified date
	DateTime? lastUpdated = Tools.GetLastModifiedTime(csprojFile);