Update MinverMinimMajor to v3

Author: stefannikolei

src/SixLabors.Fonts/SixLabors.Fonts.csproj

@@ -26,7 +26,7 @@
 
   <PropertyGroup>
     <!--Bump to V2 prior to tagged release.-->
-    <MinVerMinimumMajorMinor>2.0</MinVerMinimumMajorMinor>
+    <MinVerMinimumMajorMinor>3.0</MinVerMinimumMajorMinor>
   </PropertyGroup>
 
   <Choose>