Roll back VS varsion in sln

BepInEx.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.28307.757
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.28922.388
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BepInEx", "BepInEx\BepInEx.csproj", "{4FFBA620-F5ED-47F9-B90C-DAD1316FD9B9}"
 EndProject